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The Ambient’s review found that the Meross Thread Smart Presence Sensor MS605 can provide fast, accurate detection and expose multiple sensors through Matter over Thread. But it took repeated configuration to address false triggers, and setup changes require reactivating Bluetooth on the device.
The Meross Thread Smart Presence Sensor MS605 combines PIR motion detection, mmWave presence sensing and a light sensor, but a review by The Ambient found that getting it to detect reliably required considerable configuration. The review describes a device that can respond quickly and work with Matter-compatible smart-home systems, while warning that false triggers and an awkward Bluetooth setup may frustrate buyers seeking a simple installation.
The MS605 uses three configurable detection zones, allowing different actions to be assigned according to how close someone is to the sensor. For example, a person entering a room could trigger lighting, while movement in a nearer zone could activate another device. The Ambient also reports that users can adjust sensitivity, set delays before presence or absence is registered, and choose how the PIR and mmWave sensors work together.
Those options were not automatically dependable in the reviewer’s experience. The sensor includes an automatic calibration mode intended to account for room conditions and sources of interference, such as fans or air conditioning. The Ambient’s reviewer said that mode did not work reliably during testing, and described using the app’s event log to flag false positives or changing sensitivity manually to improve detection.
Although the MS605 connects to smart-home platforms through Matter over Thread, configuration is handled through the Meross app using Bluetooth. To conserve battery, the sensor turns off Bluetooth after setup; changing settings later requires pressing a button on the device to enable it again. The review also notes differences between platforms: Apple Home displayed the three presence sensors and light sensor, while Alexa did not expose the light sensor. Homey provided presence-duration controls that Apple Home did not.
Flexible Detection Comes With Setup Work
The review’s main takeaway is that the MS605 offers more control than a basic motion sensor, but its practical value depends on how well owners can tune it to their room and chosen smart-home platform. Separate zones can support more tailored automations, while combining PIR and mmWave is intended to detect movement and continued presence. Those features may be useful in rooms where a single on-off motion trigger is not enough.
However, setup complexity affects whether those capabilities are convenient in daily use. A sensor that misreads activity can trigger lights or other devices at the wrong time, and a required button press for Bluetooth configuration adds friction when adjustments are needed. The review therefore presents the MS605 as a potentially capable option for users willing to experiment, rather than an effortless choice for every household.
smart presence sensor for home automation
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Matter Support Across Home Platforms
Matter over Thread is the MS605’s route to connecting with compatible smart-home systems; the review says a Matter code is printed on the device. But cross-platform connectivity does not mean every system presents every feature in the same way. The Ambient’s tests found that the light sensor was available in Apple Home but not Alexa, while Homey offered additional controls for automations based on how long presence or absence lasted.
The reviewer also cautioned that timing settings can interact. If a delay is configured in the Meross app and a similar delay is added to a Homey Flow, the two can stack, making an automation take longer than expected. That is relevant for buyers because settings may be divided between the manufacturer’s app and their smart-home platform.
Physically, the sensor has a boxy design and protruding PIR dome, according to the review, but its hinged stand lets users aim it and it attaches with removable Velcro strips. It runs on one CR123A battery; Meross’s stated battery life is up to three years, though the review says actual life depends on activation frequency.
Reliability Depends on Room Setup
The review does not establish how consistently other owners will experience the calibration problems. Results may depend on room layout, interference, sensor placement and sensitivity settings, and the source provides no broader user sample or controlled comparison. It also does not give a quantified false-trigger rate or battery-life measurement from extended testing.
Platform behavior is another limitation: the review documents differences among Apple Home, Alexa and Homey, but does not establish that every feature will behave identically across other Matter-compatible systems. The source material also does not state the sensor’s price, a publication date for the review, or a complete set of tested platforms.
Check Compatibility Before Buying
Readers considering the MS605 should check whether their intended smart-home platform exposes the sensors and controls they plan to use, especially the light sensor and presence-duration settings. They should also expect to configure detection in the Meross app and may need to revisit sensitivity or timing if the sensor reports activity incorrectly. The review offers no announced firmware update or follow-up test; its reported conclusion is that the MS605 can work well once tuned, but simpler alternatives are available.
Key Questions
What sensors are built into the Meross MS605?
The MS605 combines PIR motion sensing, mmWave presence detection and a light sensor. Its mmWave detection can be divided into three configurable zones, according to The Ambient’s review.
Does the MS605 work with Matter over Thread?
Yes. The review identifies the MS605 as a Matter-over-Thread device. The specific features shown to users can vary by platform: the review found that Alexa did not expose the light sensor, while Apple Home did.
Is the Meross MS605 easy to set up?
The Ambient found that reliable detection could take trial and error. Configuration uses the Meross app over Bluetooth, and users must press a button on the sensor to reactivate Bluetooth before making later setting changes.
How long does the MS605 battery last?
Meross’s stated estimate is up to three years from one CR123A battery. The review says actual battery life depends on how often the sensor activates; it does not report a long-term battery test.
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