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The Ambient reviewed Meross’s MS605, a Matter-over-Thread presence sensor that combines PIR motion detection, mmWave radar, a light sensor and three configurable detection zones. The reviewer found it quick and accurate after setup, but said tuning false triggers and repeatedly enabling Bluetooth for changes made configuration frustrating.
The Ambient’s review of the Meross Thread Smart Presence Sensor MS605 found a feature-rich Matter-over-Thread device that can report presence across three configurable distance zones, but said getting reliable results may require substantial manual tuning. The reviewer reported that the sensor responded quickly and accurately once configured, making it a potentially capable option for smart-home automations, though not the simplest one to set up.
The MS605 combines PIR motion sensing with mmWave radar to detect movement and continued presence. It also measures ambient light and can expose three separate detection zones, allowing users to set different smart-home responses according to how close someone is to the sensor. For example, the review describes using a farther zone to switch on lights and a nearer one to trigger heating.
Configuration is handled through the Meross app over Bluetooth, even though the device connects to compatible smart-home systems through Matter over Thread. The Bluetooth link powers down to conserve battery, so users must press a button on the sensor to reconnect whenever they want to change settings. The app offers automatic calibration, false-trigger logging and manual sensitivity controls, but the reviewer said the automatic process did not reliably solve detection problems in their testing.
Integration results differ by platform. In the review, Apple Home displayed three presence sensors and the light sensor, while Alexa did not expose the light reading. Homey provided similar sensor information to Apple Home and also allowed automations based on how long presence or absence had been detected. The review cautions that overlapping delay settings in the Meross app and a Homey Flow can add together, lengthening the wait before an automation runs.
Flexible Zones, More Setup Work
The MS605’s appeal is its combination of multiple presence zones, light sensing and Matter over Thread. That mix can support more tailored automations than a basic motion sensor, such as responding differently when someone enters a room versus sits near the device. Matter compatibility may also make it useful across smart-home platforms, although the review shows that available features vary by platform.
The trade-off is the time needed to tune detection. Presence sensors can trigger lights, heating and other devices, so false positives or missed presence may make automations unreliable in everyday use. The Ambient’s assessment was that the MS605 can perform well after configuration, but buyers who want a straightforward setup may prefer a simpler device. Its capabilities are most relevant to users willing to test settings and adjust how the sensor responds in their own room.
smart presence sensor with multiple zones
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How the MS605 Is Configured
Although the MS605 is a Matter-over-Thread device, the review says initial setup and detailed adjustments take place in the Meross app via Bluetooth. Its Matter code is on the device, but the app provides access to configuration options such as sensor sensitivity, detection timing and the relationship between radar and PIR. The sensor can use radar first and PIR second by default, switch to PIR first with radar maintaining presence, or operate using radar alone.
The review describes a boxy design with a hinged stand for aiming the sensor and adhesive Velcro strips for mounting. It runs on one CR123A battery; Meross’s stated life is up to three years, but actual duration depends on how often the sensor activates. The Ambient judged the unit bulkier than some competitors, while noting that its adjustable stand makes positioning flexible.
“Flexible and powerful”
— The Ambient, in its review verdict
Platform Support and Real-World Results
The source is a single reviewer’s account, and it does not establish how the MS605 performs across different room layouts, household interference sources or long-term use. The review notes that fans or air conditioning can affect detection and that automatic calibration is intended to account for background noise, but the reviewer found it did not work reliably in their experience. Results may depend on placement and settings.
Support also varies across smart-home services: Alexa did not show the light sensor in the reviewer’s test, while Apple Home and Homey exposed it. The supplied material does not specify firmware versions or whether later updates changed platform behavior. It also does not give a tested battery-life figure; the up-to-three-year estimate is attributed to the manufacturer rather than confirmed by the review.
Check Features Before Buying
Readers considering the MS605 should check whether their chosen smart-home platform exposes the sensors and automation controls they plan to use. They should also account for the Bluetooth button press required for configuration changes and allow time to test sensitivity, zone ranges and presence delays in the intended location.
The review does not report a forthcoming software update or other next milestone. The practical next step for buyers is to compare the MS605’s multi-zone functions with simpler alternatives and decide whether its added configuration options suit their needs.
Key Questions
What does the Meross MS605 detect?
It combines PIR motion detection, mmWave presence detection and an ambient light sensor. Its three configurable distance zones can be used to trigger different responses at different ranges.
Does the MS605 work with Matter over Thread?
Yes. The review identifies it as a Matter-over-Thread device. The features available in a connected system can vary by platform, however; the review found that Alexa did not display its light-sensor reading.
Is the MS605 easy to configure?
The Ambient found setup fiddly. Automatic calibration did not reliably resolve detection issues in the reviewer’s testing, and changing settings requires pressing the sensor’s button to wake its Bluetooth connection.
How long does the battery last?
The sensor uses one CR123A battery. Meross says it can last up to three years, according to the review, but battery life depends on how often the device activates; the source does not provide a measured lifespan.
Who might find the MS605 useful?
It may suit smart-home users who want separate distance-based automations and are willing to tune detection settings. People who prioritize easy setup may find simpler alternatives more appealing, as the review notes.
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