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The Ambient’s review found that Meross’s MS605 presence sensor offers PIR and mmWave detection, three configurable range zones, a light sensor and Matter-over-Thread support. It responded quickly once configured, but false triggers and Bluetooth setup made reliable operation more involved, with some features varying by smart home platform.
The Ambient’s review of the Meross Thread Smart Presence Sensor MS605 found that it can provide fast, accurate presence detection, but only after the reviewer spent time tuning its settings. The sensor combines PIR motion detection, mmWave radar, three configurable range zones and a light sensor, with Matter over Thread support; the review’s main reservation is that setup and reliable detection can be fiddly.
The MS605 is designed to do more than register movement in a room. Its PIR and mmWave sensors can be configured to work in different ways: radar can detect presence while PIR helps identify movement, PIR can trigger detection before radar maintains it, or the user can disable PIR and rely on radar alone. The review describes the unit as operating as three motion sensors based on range, allowing different automations for movement at different distances.
Meross provides an automatic calibration option intended to account for background interference, such as fans or air conditioning. The reviewer said this did not reliably solve the problem in their experience. The app also provides a log for marking false positives and manual sensitivity controls for each range bracket. Users can adjust the delay before presence is reported and the timeout before absence is declared, meaning setup choices affect how quickly an automation responds.
Configuration takes place through the Meross app over Bluetooth, even though the device connects to smart home systems using Matter over Thread. To conserve battery, Bluetooth turns off; the reviewer says the side button must be pressed again whenever settings need to be changed. The MS605 runs on one CR123A battery, which Meross says can last up to three years, depending on how often the sensor is activated. Its hinged stand and supplied adhesive Velcro strips provide options for positioning and removal.
Three Zones, Different Smart Home Results
The MS605’s range controls could let households assign different actions to movement near or far from the sensor—for example, switching on lights when someone enters and triggering another device only when someone approaches a seating area. That flexibility depends on investing time in calibration and choosing settings that suit the room. The review’s findings suggest the sensor may be a better fit for users willing to tune automations than for anyone seeking a simple, install-and-forget motion detector.
Matter-over-Thread compatibility broadens the systems the sensor can connect to, but does not guarantee identical behavior in every platform. The Ambient reported that Apple Home displayed three sensors and the light sensor, while Alexa did not expose the light sensor. Homey offered presence-duration triggers through Flows, a capability the reviewer said was unavailable for Apple Home automations. Buyers should check the behavior they need in their chosen platform rather than assume every feature will carry across.
Meross Thread Smart Presence Sensor MS605
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Matter Setup Still Uses Meross Bluetooth
The MS605 carries a Matter code and communicates with compatible smart home systems over Thread, but those connections do not replace the Meross app for setup and detailed adjustments. The reviewer’s account separates the initial configuration process from day-to-day smart home integration: Bluetooth is used to reach the settings, while Matter over Thread makes the sensor available to a supported platform.
That distinction matters because the review found settings spread across the Meross app and the connected platform. In Homey, for example, the reviewer warned that an app-level presence delay and a similar delay in a Flow can add together. A 30-second delay configured in each place resulted in a one-minute wait before the rule ran. This is a reported test experience, not a universal timing result for all users or platforms.
“Flexible and powerful”
— The Ambient, in its review verdict
smart home motion sensors PIR mmWave
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Platform Features and Battery Life Vary
The review does not establish how consistently the MS605 will detect presence in different rooms, layouts or sources of interference. The reviewer reported that automatic calibration did not work reliably in their experience, but the supplied material gives no broader testing data or results from other users. It also does not provide a measured battery-life result; three years is a stated estimate, and activation frequency affects consumption.
Smart home support is not uniform in the review’s tests: Alexa did not show the light sensor, while Apple Home and Homey exposed different controls. The source does not specify whether later software updates could alter those platform differences. The review also provides no prices or direct comparative test results against simpler sensors, so it cannot establish whether the MS605 is the best value for a particular buyer.
Matter over Thread presence sensor
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Check Your Platform Before Buying
The review’s practical advice is to decide which detection zones and automations are needed, then check how the intended smart home platform exposes the MS605’s sensors and timing controls. Anyone considering it should also allow time to test sensitivity, review false-positive logs and adjust presence and absence delays. The supplied source describes no announced product update or follow-up testing; whether Meross changes setup or platform support remains unknown.
smart home automation motion detection
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Key Questions
What does the Meross MS605 detect?
It combines PIR motion detection and mmWave radar, offers three configurable detection ranges, and includes a light sensor. The reviewer says the PIR and radar can be configured to work in different ways or used separately.
Does the MS605 work with Apple Home, Alexa and Homey?
The review reports Matter-over-Thread connections with these systems, but features differed in testing. Apple Home showed three sensors and the light sensor; Alexa did not expose the light sensor; Homey supported presence-duration Flows, according to The Ambient.
Is the MS605 easy to configure?
The Ambient found that reliable detection could take substantial adjustment. The Meross app offers automatic calibration, false-positive logging and manual sensitivity controls, but Bluetooth settings access requires pressing the sensor’s side button after the connection shuts down.
How long does the MS605 battery last?
It uses one CR123A battery. Meross gives an estimate of up to three years, but the actual lifespan depends on how often the sensor activates; the review does not report a measured battery-life test.
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