Smart smoke detectors add connected alerts and, on some models, carbon monoxide detection to standard home alarms. My best overall pick is the First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm for buyers who want hardwired power and both types of detection in one unit. The X-Sense Wireless Interconnected Smoke and CO Detectors stand out for multi-room wireless coverage, while the Kidde Smart Smoke Detector with Ring models suit homes already using Ring. The main tradeoffs are hardwired versus battery power, smoke-only versus smoke-and-CO coverage, and the extra setup or gateway needs of connected systems. Read on for the full comparison and guidance on matching a detector to your wiring, rooms, and alert preferences.
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Key Takeaways
- First Alert SC5 Hardwired earns the lead by combining hardwired power, smoke and CO detection, and smart connectivity in one device; its battery-powered counterpart fits homes without compatible wiring.
- X-Sense and Heiman use interconnected multi-unit systems, making them more suited to covering several rooms than choosing a single app-connected alarm.
- The Kidde Ring models split into smoke-only and smoke-and-CO versions, and into hardwired and battery-powered options; check the exact model before buying.
- Hardwired detectors with backup batteries can fit homes with existing alarm wiring, but they may add installation work and still need a check of wiring and compatibility.
- The lineup’s strongest choice depends on the home’s existing ecosystem: Ring users may prefer a Kidde Ring model, while buyers seeking combined detection and hardwired power have a clearer fit in the First Alert SC5.
| X-Sense Wireless Interconnected Smoke and Carbon Monoxide Detectors, 3-Pack |  | Best for Wireless Whole-Home Alarms | Model: XP0H-WN | Pack size: 3 alarms | Detection: Smoke and carbon monoxide | VIEW LATEST PRICE | See Our Full Breakdown |
| Heiman S1-R Wireless Interconnected Smoke Detectors with Gateway, 6-Pack |  | Best for App Alerts Without Hardwiring | Model: S1-R | Included: 6 smoke detectors and 1 gateway | Sensor: Dual-beam photoelectric | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Hardwired Smart Smoke Detector with App Connectivity and AA Backup Battery |  | Best for Hardwired App Monitoring | Model: 20SAR-W | Detection: Smoke | Power: 120V AC with 2 AA backup batteries | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Smart Smoke and CO Detector with Ring, Hardwired with AA Battery Backup, RGCUAR-RW |  | Best Ring Pick for Smoke and CO | Model: RGCUAR-RW | Detection: Smoke and carbon monoxide | Power: Hardwired with AA battery backup | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Smart Smoke Detector with Ring, Hardwired and AA Battery (RGSAR-RW) |  | Best for Ring-Connected Smoke Alerts | Model: RGSAR-RW | Detection: Smoke | Power: Hardwired with AA battery backup | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Hardwired Smart Smoke and Carbon Monoxide Detector with App Connectivity and Voice Alerts |  | Best for Hardwired Whole-Home Upgrades | Brand: Kidde | Model: 30CUAR-W | Detection: Smoke and carbon monoxide | VIEW LATEST PRICE | See Our Full Breakdown |
| First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm |  | Best for Voice Alerts with Hazard Location | Brand: First Alert | Model: SMCO600NV-AC | Alarm type: Smoke and carbon monoxide combination alarm | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Smart Smoke and CO Detector with Ring, AA Battery, RGCUDR-RW |  | Best Battery-Powered Ring Option for CO Coverage | Brand: Kidde | Model: RGCUDR-RW | Detection: Smoke and carbon monoxide | VIEW LATEST PRICE | See Our Full Breakdown |
| Kidde Smart Smoke Detector with Ring, AA Battery, RGSDR-RW |  | Best for Smoke-Only Ring Setups | Brand: Kidde | Model: RGSDR-RW | Detection: Smoke | VIEW LATEST PRICE | See Our Full Breakdown |
| First Alert SC5 Battery-Powered Smart Smoke and Carbon Monoxide Alarm |  | Best Battery-Powered First Alert Combination Alarm | Brand: First Alert | Model: SMCO600NV | Alarm type: Combination smoke and carbon monoxide alarm | VIEW LATEST PRICE | See Our Full Breakdown |
| smart smoke detector | Model | Detection | Power | Certifications |
|---|---|---|---|---|
| X-Sense Wireless Interconnecte | XP0H-WN | Smoke and carbon monoxide | Sealed lithium battery | UL 217 and UL 2034 |
| Heiman S1-R Wireless Interconn | S1-R | — | — | UL 217 10th Edition, CSFM, FCC |
| Kidde Hardwired Smart Smoke De | 20SAR-W | Smoke | 120V AC with 2 AA backup batteries | — |
| Kidde Smart Smoke and CO Detec | RGCUAR-RW | Smoke and carbon monoxide | Hardwired with AA battery backup | UL 217 and FCC |
| Kidde Smart Smoke Detector wit | RGSAR-RW | Smoke | Hardwired with AA battery backup | UL 217 and FCC |
| Kidde Hardwired Smart Smoke an | 30CUAR-W | Smoke and carbon monoxide | 120V AC with 2 AA battery backup | UL 217, UL 2034, FCC |
| First Alert SC5 Hardwired Smar | SMCO600NV-AC | — | — | — |
| Kidde Smart Smoke and CO Detec | RGCUDR-RW | Smoke and carbon monoxide | 2 AA alkaline batteries, included | UL 217, FCC |
| Kidde Smart Smoke Detector wit | RGSDR-RW | Smoke | 2 AA alkaline batteries, included | UL 217, FCC |
| First Alert SC5 Battery-Powere | SMCO600NV | — | — | — |
More Details on Our Top Picks
X-Sense Wireless Interconnected Smoke and Carbon Monoxide Detectors, 3-Pack
The X-Sense three-pack suits buyers who want smoke and carbon monoxide coverage with alarms that sound together, but do not need phone alerts. Its sealed 10-year batteries avoid routine battery changes, and the larger mounting brackets can cover marks or screw holes left by older alarms. Compared with the Heiman S1-R, it skips the gateway, app notifications, and smart-home links; in return, there is no Wi-Fi setup to manage. It also combines smoke and CO detection in each unit, unlike Heiman’s smoke-only detectors. The main compromise is that this is an interconnected alarm system, not a connected smart system: it has no Wi-Fi or base-station support. I’d choose it for straightforward coordinated alerts, but skip it if remote monitoring is a priority.
Pros:- Each alarm detects both smoke and carbon monoxide.
- Wireless interconnection makes all units sound when one detects a hazard.
- Sealed 10-year lithium batteries reduce battery-replacement tasks.
- Large mounting brackets can cover old screw holes and ceiling marks.
Cons:- No Wi-Fi or app notifications for alerts when nobody is home.
- Does not support a base station or broader smart-home system.
Best for: Households that want smoke and CO detection across several rooms with alarms that sound together, but do not need app alerts.
Not ideal for: Buyers who want phone notifications, smart-home integration, or a system that can connect to a base station.
- Model:XP0H-WN
- Pack size:3 alarms
- Detection:Smoke and carbon monoxide
- Interconnection:Wireless; alarms sound together
- Power:Sealed lithium battery
- Battery life:10 years
- Sensors:Electrochemical and photoelectric
- Certifications:UL 217 and UL 2034
Our verdict“Choose this three-pack for coordinated smoke and CO alarms without app or hub requirements; choose the Heiman S1-R if remote alerts matter more.”
Heiman S1-R Wireless Interconnected Smoke Detectors with Gateway, 6-Pack
The Heiman S1-R is the strongest fit here for buyers who want wireless smoke alarms plus remote notifications without replacing hardwired units. Its six photoelectric detectors can sound together locally even if Wi-Fi is down; the gateway adds app and email alerts when it is connected. Compared with the X-Sense three-pack, Heiman offers a larger linked network and remote alerts, but detects smoke only rather than carbon monoxide. Magnetic mounting and long-life CR123A batteries also make installation and upkeep less involved than a hardwired option such as the Kidde 20SAR-W. The tradeoff is added setup: smart alerts rely on the gateway and a 2.4 GHz Wi-Fi network, and the kit does not serve as CO protection. I’d favor it for broad wireless smoke coverage, not as a single solution for both hazards.
Pros:- Six smoke detectors can interconnect locally, even without Wi-Fi.
- Gateway enables app and email alerts when connected to Wi-Fi.
- Magnetic mounting and 10-year batteries simplify installation and routine upkeep.
- System supports up to 24 linked detectors and select smart-home platforms.
Cons:- Detects smoke only; separate CO alarms are needed for carbon monoxide protection.
- Remote alerts require the gateway and a 2.4 GHz Wi-Fi setup.
Best for: Homeowners or renters seeking multiple interconnected smoke alarms with app alerts, especially where hardwiring is impractical.
Not ideal for: Buyers who need carbon monoxide detection in the same units, use only 5 GHz Wi-Fi, or want app alerts without a gateway.
- Model:S1-R
- Included:6 smoke detectors and 1 gateway
- Sensor:Dual-beam photoelectric
- Battery:CR123A lithium; 10-year life
- Alarm volume:85 dB
- Gateway network:2.4 GHz Wi-Fi
- Maximum linked detectors:24
- Certifications:UL 217 10th Edition, CSFM, FCC
Our verdict“Pick the Heiman kit for expandable wireless smoke coverage with remote alerts, but pair it with CO alarms if you need protection from both hazards.”
Kidde Hardwired Smart Smoke Detector with App Connectivity and AA Backup Battery
For a home with existing alarm wiring, the Kidde 20SAR-W brings phone alerts and backup power to a smoke-only detector without requiring a separate hub. Notifications can flag smoke or a low battery while you are away, and the AA backup batteries keep the unit powered through an outage. Its cooking-focused sensing is intended to reduce nuisance alarms, a useful distinction for kitchens or open-plan spaces; the Kidde Ring RGSAR-RW also targets cooking-related false alarms, but uses the Ring app rather than Kidde’s app. Unlike the X-Sense XP0H-WN, this model is not a battery-only installation and does not detect carbon monoxide. It also depends on 2.4 GHz Wi-Fi for app connectivity. I’d shortlist it when hardwiring is already available and remote smoke alerts are the priority.
Pros:- Kidde app sends smoke and low-battery alerts remotely.
- AA backup batteries provide power during electrical outages.
- Enhanced sensing is designed to reduce cooking-related nuisance alarms.
- Connects to Wi-Fi without an additional hub.
Cons:- Requires hardwired installation and may not suit homes without compatible wiring.
- App connectivity requires a 2.4 GHz Wi-Fi network.
- Smoke-only detection means a separate alarm is needed for carbon monoxide.
Best for: Homeowners with compatible hardwired alarm wiring who want Kidde app alerts and battery backup for smoke detection.
Not ideal for: Renters or homes without compatible wiring, buyers who need CO detection in the same alarm, or households without 2.4 GHz Wi-Fi.
- Model:20SAR-W
- Detection:Smoke
- Power:120V AC with 2 AA backup batteries
- Connectivity:2.4 GHz Wi-Fi
- App alerts:Smoke and low-battery notifications
- Lifespan:10 years
- Certification:UL 217 8th and 9th Edition; FCC
- Included items:Alarm, wiring harness, mounting bracket, 2 AA batteries, user guide
Our verdict“Choose the 20SAR-W for app-connected smoke protection in a hardwired home; choose the X-Sense XP0H-WN if you need battery-only smoke and CO alarms.”
Kidde Smart Smoke and CO Detector with Ring, Hardwired with AA Battery Backup, RGCUAR-RW
The RGCUAR-RW is the Ring-connected choice for buyers who want smoke and carbon monoxide alerts from one hardwired alarm. Ring app notifications for smoke, CO, and low battery do not require a subscription, while optional monitoring is a separate service. Compared with the Kidde RGSAR-RW, this model adds CO detection; RGSAR-RW is smoke-only, so it leaves a second hazard to another device. The RGCUAR-RW also works with Alexa-enabled devices and can connect with compatible hardwired alarms, which helps it fit into an existing wired setup. Its limits are practical: it needs hardwiring, and 24/7 monitoring costs extra. The faster-detection claim is based on internal testing, so I would not use it as the deciding factor. This pick makes most sense for Ring households that want both hazards covered at one wired location.
Pros:- Detects both smoke and carbon monoxide.
- Ring app alerts for smoke, CO, and low battery do not require a subscription.
- AA backup battery supports operation during power interruptions.
- Can connect with compatible hardwired alarms and Alexa-enabled devices.
Cons:- Requires hardwired installation, limiting placement in homes without compatible wiring.
- 24/7 monitoring is optional and requires a paid subscription.
- Ring app connectivity may be less useful to households using other smart-home systems.
Best for: Ring and Alexa households with hardwired alarm wiring that want app notifications for both smoke and carbon monoxide.
Not ideal for: Renters, homes without compatible hardwiring, or buyers who want a battery-only alarm or included 24/7 monitoring.
- Model:RGCUAR-RW
- Detection:Smoke and carbon monoxide
- Power:Hardwired with AA battery backup
- App notifications:Ring alerts for smoke, CO, and low battery
- Smart-home compatibility:Alexa-enabled devices
- Alarm connectivity:Compatible hardwired alarms
- Monitoring:Optional 24/7 monitoring requires a subscription
- Certifications:UL 217 and FCC
Our verdict“Choose the RGCUAR-RW for Ring app alerts covering smoke and CO in a hardwired home; skip it if you need battery-only installation.”
Kidde Smart Smoke Detector with Ring, Hardwired and AA Battery (RGSAR-RW)
The RGSAR-RW is a focused option for Ring users who want smoke and low-battery alerts without paying for basic app notifications. It also sends alerts to Alexa-enabled devices and supports whole-home notification through connected hardwired alarms, so a trigger elsewhere in the wired network can be more useful than a single standalone alert. Compared with the Kidde RGCUAR-RW, this model covers smoke only, not carbon monoxide; the RGCUAR-RW is the better fit if one device must monitor both hazards. Like the Kidde 20SAR-W, it needs hardwired installation and has sensing designed to reduce cooking-related nuisance alarms, but its app connection centers on Ring. Optional 24/7 smoke monitoring requires a subscription, and the faster-detection claim is based on internal testing. I’d pick it for a Ring-based wired setup that already handles CO separately.
Pros:- Ring app provides smoke and low-battery alerts without a subscription.
- Can relay alerts from connected hardwired alarms across the home.
- Alexa-enabled devices can provide notifications.
- Enhanced sensing is designed to reduce cooking-related nuisance alarms.
Cons:- Smoke-only detection requires a separate carbon monoxide alarm.
- Hardwired installation limits use where compatible wiring is unavailable.
- 24/7 smoke monitoring requires an optional subscription.
Best for: Ring households with hardwired alarms that need smoke and low-battery app alerts and already have separate CO protection.
Not ideal for: Buyers who need carbon monoxide detection in the same unit, lack hardwired connections, or want 24/7 monitoring without a subscription.
- Model:RGSAR-RW
- Detection:Smoke
- Power:Hardwired with AA battery backup
- App notifications:Smoke and low-battery alerts via Ring app
- Alexa compatibility:Notifications on Alexa-enabled devices
- Alarm connectivity:Supports connected hardwired alarms
- Monitoring:Optional 24/7 smoke monitoring requires a Ring subscription
- Certifications:UL 217 and FCC
Our verdict“Choose the RGSAR-RW for Ring-based smoke alerts in a hardwired home with separate CO protection; choose the RGCUAR-RW if you want both hazards detected.”
Kidde Hardwired Smart Smoke and Carbon Monoxide Detector with App Connectivity and Voice Alerts
For buyers replacing a hardwired alarm, this Kidde combination detector adds app alerts without giving up wired power or battery backup. The Kidde app can report smoke, carbon monoxide, and low-battery warnings, while voice alerts identify the hazard so a warning is more informative than a standard siren. Enhanced sensing is designed to reduce cooking-related nuisance alarms, a useful distinction for alarms near kitchens. Unlike the battery-powered Kidde Smart Smoke and CO Detector with Ring, this model relies on an existing wired connection and connects with compatible Kidde hardwired alarms for broader coverage. The tradeoff is a more involved installation than a standalone battery unit, and existing alarm compatibility may vary. App connectivity also requires a 2.4 GHz Wi-Fi network; it does not need an additional hub.
Pros:- App alerts cover smoke, carbon monoxide, and low-battery warnings.
- Voice alerts distinguish smoke from carbon monoxide hazards.
- AA backup batteries provide power during outages.
- Connects to compatible Kidde hardwired alarms without an extra hub.
Cons:- Requires hardwired installation, so it is less flexible than battery-powered options.
- App connectivity requires a 2.4 GHz Wi-Fi network.
- Interconnection compatibility can vary across existing alarm models.
Best for: Homeowners replacing a compatible hardwired Kidde alarm who want app alerts for both smoke and carbon monoxide.
Not ideal for: Renters or people without existing alarm wiring, and households using only 5 GHz Wi-Fi.
- Brand:Kidde
- Model:30CUAR-W
- Detection:Smoke and carbon monoxide
- Power:120V AC with 2 AA battery backup
- Connectivity:2.4 GHz Wi-Fi; Kidde app
- Certifications:UL 217, UL 2034, FCC
- Included components:Alarm, 2 AA batteries, mounting bracket, wiring harness, user guide
Our verdict“Choose this Kidde if you have compatible hardwired alarms and want app-connected smoke and CO protection with backup power.”
First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm
The First Alert SC5 hardwired alarm suits buyers who want a combination detector that can report not only the hazard type but also its location. Phone alerts through the First Alert app add remote awareness, while voice warnings identify danger and location to help residents respond across a larger home. Its battery backup keeps protection available during a power outage, and compatible alarms can interconnect. Compared with the Kidde Hardwired Smart Smoke and Carbon Monoxide Detector, the SC5’s clearest stated distinction is its location-specific voice warning; Kidde explicitly lists low-battery app alerts and a 2.4 GHz Wi-Fi requirement. First Alert describes Precision Detection Technology as a way to reduce nuisance alarms, but the supplied product details do not specify its network requirements or battery type. This is a hardwired replacement, not a simple battery-only installation.
Pros:- Phone alerts report smoke and carbon monoxide events.
- Voice warnings identify both hazard type and location.
- Battery backup maintains operation during power outages.
- Interconnects with compatible alarms.
Cons:- Hardwired power makes installation less flexible than a battery-powered detector.
- Interconnection is limited to compatible alarms.
- The provided specifications do not identify the backup battery type or Wi-Fi band.
Best for: Homeowners replacing a hardwired combination alarm who value spoken alerts that identify where a hazard is detected.
Not ideal for: Renters or buyers who need a no-wiring alarm, or shoppers who require clearly specified app network and battery details before purchase.
- Brand:First Alert
- Model:SMCO600NV-AC
- Alarm type:Smoke and carbon monoxide combination alarm
- Power source:Corded electric
- Backup battery:3V lithium battery pack
- Dimensions:5.75 x 1.6 x 5.75 inches
- Weight:16 ounces
- Connectivity:First Alert app alerts; interconnects with compatible alarms
Our verdict“Pick the First Alert SC5 hardwired model if location-specific voice warnings matter more to you than a battery-only installation.”
Kidde Smart Smoke and CO Detector with Ring, AA Battery, RGCUDR-RW
This battery-powered Kidde is a flexible choice for Ring households that need both smoke and carbon monoxide detection without installing wiring. It sends alerts through the Ring app, including low-level CO and low-battery warnings, and can interconnect wirelessly with other Kidde alarms. Alexa compatibility adds another way to receive notifications. Compared with the smoke-only Kidde Smart Smoke Detector with Ring, this model covers an additional hazard, which makes it the more fitting choice when an existing CO alarm is absent or being replaced. App notifications do not require a subscription, but optional 24/7 monitoring does. Its two AA batteries also need eventual replacement, and the product is most useful to buyers comfortable using Ring’s app ecosystem rather than those seeking a hardwired installation.
Pros:- Detects both smoke and carbon monoxide.
- Ring app alerts include low-level CO and low-battery warnings.
- App notifications are available without a subscription.
- Wirelessly interconnects with compatible Kidde alarms and works with Alexa.
Cons:- Optional 24/7 monitoring requires a Ring subscription.
- Requires two AA alkaline batteries that need replacement.
- App alerts and Alexa features depend on compatible connected devices and services.
Best for: Ring and Alexa households that want a wire-free alarm with both smoke and carbon monoxide alerts, including low-level CO notifications.
Not ideal for: Buyers who want hardwired power, avoid the Ring ecosystem, or expect 24/7 professional monitoring without a subscription.
- Brand:Kidde
- Model:RGCUDR-RW
- Detection:Smoke and carbon monoxide
- Power:2 AA alkaline batteries, included
- Connectivity:Ring app notifications; wireless interconnectivity with Kidde alarms
- Alexa compatibility:Yes
- Certifications:UL 217, FCC
- Monitoring:Optional 24/7 monitoring requires a Ring subscription
Our verdict“Choose this Ring-connected Kidde if you need battery-powered smoke and CO detection with app alerts and do not require included professional monitoring.”
Kidde Smart Smoke Detector with Ring, AA Battery, RGSDR-RW
If carbon monoxide detection is already handled elsewhere, this smoke-only Ring-connected Kidde keeps the alarm setup focused on fire detection. It sends smoke and low-battery notifications through the Ring app without requiring a subscription for those alerts, and its wire-free interconnection can make compatible Kidde alarms sound together. Alexa notifications are supported, and enhanced sensing is designed to reduce cooking-related nuisance alarms. Compared with the Kidde Smart Smoke and CO Detector with Ring, this model gives up CO sensing and low-level CO alerts; in return, it is the more direct fit for adding smoke coverage where a separate CO alarm is already in place. It runs on two AA batteries, and optional 24/7 smoke monitoring requires a paid Ring subscription. Buyers wanting one device for both hazards should choose the combination model instead.
Pros:- Sends smoke and low-battery alerts through the Ring app without a subscription.
- Battery-powered installation does not require alarm wiring.
- Compatible Kidde alarms can interconnect wirelessly.
- Supports Alexa notifications and sensing designed to reduce cooking-related false alarms.
Cons:- Does not detect carbon monoxide.
- Optional 24/7 smoke monitoring requires a Ring subscription.
- Requires two AA alkaline batteries.
Best for: Ring households adding smoke detection in areas where carbon monoxide is covered by a separate alarm.
Not ideal for: Buyers who need carbon monoxide detection in the same unit or want 24/7 monitoring without a Ring subscription.
- Brand:Kidde
- Model:RGSDR-RW
- Detection:Smoke
- Power:2 AA alkaline batteries, included
- Connectivity:Ring app notifications; wire-free interconnectivity with Kidde alarms
- Voice assistant:Alexa notifications
- Certifications:UL 217, FCC
- Monitoring:Optional 24/7 smoke monitoring requires a Ring subscription
Our verdict“Pick this smoke-only Kidde for Ring app alerts and wireless Kidde interconnection when you already have separate CO protection.”
First Alert SC5 Battery-Powered Smart Smoke and Carbon Monoxide Alarm
The battery-powered First Alert SC5 brings smoke and carbon monoxide detection, app alerts, and spoken hazard details to homes where hardwiring is impractical. Its voice warnings include the hazard and location, while low-battery notifications offer a prompt to replace the cell before routine chirps become the first sign of a problem. The unit interconnects with compatible alarms and is listed as compatible with Google Nest Protect alarms. Compared with the hardwired First Alert SC5, this version avoids a wired installation and is easier to place where existing wiring is unavailable. The tradeoff is reliance on a 3V CR123A lithium battery, and compatibility still depends on the alarms already in the home. Buyers choosing between this and the Ring-connected Kidde combination alarm should also weigh which app ecosystem they prefer.
Pros:- Combines smoke and carbon monoxide detection in one alarm.
- App alerts and voice warnings provide hazard and location information.
- Low-battery notifications help flag battery replacement needs.
- Interconnects with compatible alarms and is listed as compatible with Google Nest Protect.
Cons:- Requires a 3V CR123A lithium battery.
- Interconnection works only with compatible alarms.
- Battery power requires ongoing replacement rather than a hardwired connection.
Best for: Households seeking a battery-powered smoke and CO alarm with First Alert app alerts and spoken hazard-location warnings.
Not ideal for: Buyers who prefer standard AA replacements, need hardwired power, or have alarms outside the compatible interconnection range.
- Brand:First Alert
- Model:SMCO600NV
- Alarm type:Combination smoke and carbon monoxide alarm
- Power source:Battery powered
- Battery:3V CR123A lithium
- Connectivity:First Alert app alerts; interconnects with compatible alarms
- Dimensions:5.75 x 1.6 x 5.75 inches
- Weight:16 ounces
- Color:White
Our verdict“Choose this First Alert SC5 if you want a battery-powered combination alarm with location-specific voice alerts and use compatible connected alarms.”
How We Picked
I ranked these smart smoke detectors by how well their core safety and connectivity choices match common household needs. I compared smoke-only and smoke-and-CO coverage, hardwired and battery power, interconnection between units, app or smart-home integration, and the setup demands implied by features such as a separate gateway. I also weighed how clearly each product serves a distinct use case, from replacing an existing wired alarm to adding alerts across several rooms.
The ranking favors versatility and useful coverage over feature count alone. That puts the hardwired First Alert SC5 Smoke and CO model first for a broad set of homes, while its battery-powered version is a better fit where wiring is unavailable. The X-Sense and Heiman multi-unit kits rank well for whole-home interconnection, and Kidde models are placed according to their power source, detection type, and Ring or app-based connection. Buyers should confirm wiring compatibility, regional requirements, and smart-home support before choosing.
| smart smoke detector | Detection | Certifications | Brand |
|---|---|---|---|
| X-Sense Wireless Interconnecte | Smoke and carbon monoxide | UL 217 and UL 2034 | — |
| Heiman S1-R Wireless Interconn | — | UL 217 10th Edition, CSFM, FCC | — |
| Kidde Hardwired Smart Smoke De | Smoke | — | — |
| Kidde Smart Smoke and CO Detec | Smoke and carbon monoxide | UL 217 and FCC | — |
| Kidde Smart Smoke Detector wit | Smoke | UL 217 and FCC | — |
| Kidde Hardwired Smart Smoke an | Smoke and carbon monoxide | UL 217, UL 2034, FCC | Kidde |
| First Alert SC5 Hardwired Smar | — | — | First Alert |
| Kidde Smart Smoke and CO Detec | Smoke and carbon monoxide | UL 217, FCC | Kidde |
| Kidde Smart Smoke Detector wit | Smoke | UL 217, FCC | Kidde |
| First Alert SC5 Battery-Powere | — | — | First Alert |
Factors to Consider When Choosing Smart Smoke Detectors
The right detector depends less on a long feature list than on how it will fit into your home. I would start with the building’s wiring and existing alarms, then decide whether connected notifications, interconnection, or carbon monoxide coverage matters most.
Match the Power Source to Your Home
Hardwired models can be a natural replacement when a home already has compatible alarm wiring, and backup batteries help keep an alarm powered during an outage. They are not automatically a simple swap: connector types, mounting bases, and local rules can affect compatibility. Battery-powered detectors avoid wiring work and can suit older homes or rooms without alarm wiring, though battery checks become part of routine upkeep. A common mistake is choosing by the word “hardwired” alone without checking the existing unit’s wiring and connector. For a rental or a home where electrical changes are impractical, a battery model may be the more workable choice. If replacing a connected wired network, verify whether the new alarms can communicate with the existing units or require a full set replacement.
Decide Whether You Need Smoke Detection, CO Detection, or Both
Combination smoke-and-CO alarms cover two hazards in one device, which can reduce the number of units needed in a room. Smoke-only models may make sense where CO detection is already provided by a separate, correctly placed alarm. Do not assume that a detector with “smart” in its name also senses carbon monoxide; this roundup includes both smoke-only and combination models. Check the product label and placement instructions, since smoke and CO alarms can have different location guidance. When replacing an existing combination unit, choose a replacement that preserves both functions rather than treating the old device as a smoke alarm only. A household with fuel-burning appliances or an attached garage should map its CO coverage before deciding to buy smoke-only alarms.
Understand Interconnection Before Buying a Multi-Pack
Interconnected alarms can alert occupants in other rooms when one unit detects a hazard, a useful distinction for larger or multi-storey homes. Wireless kits such as the X-Sense and Heiman options focus on linking multiple detectors, while app-connected single alarms may prioritize remote notifications instead. A gateway can be part of the system, so check what hardware and network setup the kit requires before planning installation. Do not assume that alarms from different brands, or even different product families, will interconnect with each other. Count the locations that need coverage and compare that with the included units rather than buying a pack based only on its headline size. For a small home, a multi-unit network may add setup without much benefit; for a spread-out home, room-to-room alerts may matter more than app features.
Choose Connectivity That Fits Your Smart-Home Habits
App and ecosystem support can determine whether alerts fit naturally into daily routines. Ring-linked Kidde models make the most sense for households already using Ring, while other connected models may rely on their own app or a dedicated gateway. Before buying, check whether remote alerts need an internet connection, account setup, or extra hardware, and confirm that your phone and home network are supported. A connected alarm should still sound locally if Wi-Fi or a service is unavailable; read the product documentation to understand how its core alarm functions behave offline. Some buyers want phone notifications for travel or remote property checks, while others would rather avoid another app and account. Choose connectivity for a specific need, not just because the feature is available.
Plan Placement, Installation, and Ongoing Checks
Placement affects protection, so follow the manufacturer’s instructions and applicable local codes rather than installing every unit in the same convenient spot. Think through bedrooms, hallways, levels, and areas where cooking or steam could prompt nuisance alarms, using the guidance for the exact model. Hardwired replacements may call for an electrician or a careful compatibility check; battery units still need proper mounting and periodic testing. Include routine alarm tests, battery checks where applicable, and sensor replacement intervals in your household maintenance plan. A smart notification does not replace an audible alarm, local testing, or required maintenance. Before removing an old detector, confirm that the replacement provides the same coverage and that no other alarm in the home depends on its interconnection.
Pay for Features That Solve a Real Household Problem
Extra connectivity is most useful when it changes how you respond, such as notifying someone away from home or linking alarms across distant rooms. Combination detection can simplify coverage, but it may be unnecessary if separate CO alarms already meet the home’s needs. A multi-pack can lower the effort of building a linked system, yet unused units do not improve protection if they are never installed in suitable locations. Prioritize dependable alarm coverage, power fit, and compatible interconnection before convenience features. Buyers setting up a new home may value a matched system, while someone replacing one failed alarm may need a compatible single unit instead. Compare the whole setup—including gateway, phone requirements, and any existing alarms—rather than judging a detector by its app features alone.
Frequently Asked Questions
Can I replace a hardwired smoke alarm with a battery-powered smart detector?
Sometimes, but not as a direct like-for-like replacement in every home. A battery-powered model may mount in the same area, yet it will not use the home’s alarm wiring or necessarily connect to other wired alarms. Check local requirements, the existing alarm system, and the new detector’s installation instructions before removing a hardwired unit. If the old alarms are interconnected, replacing only one may leave the system with inconsistent alerts. Ask a qualified electrician or local authority if you are unsure whether a battery-only replacement meets requirements.
Should I choose a smoke-and-CO detector or buy separate alarms?
A combination detector can simplify coverage by providing smoke and carbon monoxide sensing in one unit, as seen in several First Alert and Kidde options here. Separate alarms can offer more flexibility in placement, particularly if the best locations for smoke and CO coverage differ under the manufacturers’ instructions. First check which hazards your current alarms cover and whether your home already has working CO detectors. Do not count a smoke-only model as CO protection. Whichever format you choose, map coverage across the home rather than relying on a single device to protect every area.
Will these smart detectors work with alarms I already have?
Compatibility varies by brand and alarm system, so do not assume that a new smart detector will interconnect with older units. The X-Sense and Heiman kits are designed around their own wireless systems, and Ring-linked Kidde models have a different connected setup. Existing hardwired alarms may use particular connectors or communication standards that a replacement does not support. Check the exact model documentation for interconnection and wiring details before purchase. If compatibility is unclear, replacing alarms as a matched set may be safer and simpler than mixing product families.
Do I need a gateway or Wi-Fi for phone alerts?
It depends on the product’s connection method. Some multi-unit systems use a gateway to link detectors to the network, while other models connect through a supported smart-home or app setup. Interconnection between alarms and remote phone notifications are separate functions: a system may sound alerts across rooms without sending them outside the home. Check whether the exact model requires a gateway, a compatible network, an account, or a specific ecosystem such as Ring. Also confirm what the alarm does if the internet or power connection is unavailable, since local warning should remain a priority.
Which type is a better fit for a home without existing alarm wiring?
Battery-powered models are usually the simpler starting point when there is no compatible wiring, including the battery-powered First Alert SC5 and Kidde Ring options in this lineup. For coverage across multiple rooms, compare those single-unit choices with wireless interconnected kits such as X-Sense or Heiman. The right pick depends on whether you want a connected system, CO detection, or Ring integration, not only on installation convenience. Confirm the required number of detectors and their placement guidance before choosing a pack. If local building rules call for a particular type of installation, follow those rules rather than selecting solely for easy setup.
Conclusion
For best overall coverage, I recommend the First Alert SC5 Hardwired Smart Smoke and Carbon Monoxide Alarm when the home has compatible wiring and needs both types of detection. For best value across several rooms, the X-Sense wireless smoke-and-CO pack is a strong fit for buyers who want linked coverage without choosing individual alarms one at a time. The best premium-style ecosystem fit is a Kidde Ring model for households already invested in Ring, with the smoke-and-CO version preferable when both hazards need coverage. For beginners or homes without alarm wiring, the battery-powered First Alert SC5 offers a straightforward route to connected smoke-and-CO detection. For multi-room wireless interconnection, compare X-Sense with the Heiman gateway kit and choose based on the setup and coverage your home requires. Before buying, verify placement, wiring, interconnection, and smart-home compatibility for the exact model.
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