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The Ambient’s review found the Meross Thread Smart Presence Sensor MS605 offers PIR and mmWave detection, three configurable presence zones, a light sensor and Matter-over-Thread connectivity. It responded quickly and accurately once configured, but the reviewer reported that setup and tuning could be frustrating, and features vary across smart-home platforms.
The Ambient’s review of the Meross Thread Smart Presence Sensor MS605 found a capable, flexible device that could detect presence quickly and accurately after setup, but said getting reliable results took considerable configuration. The sensor combines PIR motion detection, mmWave radar, three adjustable detection zones and a light sensor, with Matter over Thread intended to support use across compatible smart-home systems.
The reviewer described the MS605 as a sensor that can act as three separate motion sensors, each assigned to a different range, as well as a light sensor. That lets users set different responses for different distances—for example, switching on lights when someone enters a room and triggering another device only when someone comes closer. The device can use PIR and radar together, or be configured to rely on radar alone.
In The Ambient’s testing, the MS605 was fast and accurate when configured correctly. The reviewer said the automatic calibration option did not work reliably in their experience. They instead used the app’s event log to identify false triggers and adjusted sensitivity for individual range zones. Settings for how long motion must be detected before presence is reported, and how long the sensor waits before reporting absence, also affect its behavior.
The sensor connects to the Meross app over Bluetooth for setup and configuration, even though it communicates with compatible smart-home systems using Matter over Thread. To conserve battery, Bluetooth shuts down, so the reviewer had to press the sensor’s side button before making each settings change. The unit uses one CR123A battery; Meross’s stated battery life is up to three years, with actual life dependent on how often it is activated.
Setup Shapes the MS605 Experience
The review’s main finding is that the MS605’s headline flexibility comes with a practical cost: users may need to spend time tuning the device before its detection behaves as intended. That matters because presence sensors often trigger other equipment, such as lights or heating. A false presence or an early absence signal can make an automation behave differently from the user’s plan.
Matter over Thread support broadens the sensor’s potential compatibility, but does not mean every platform exposes every feature in the same way. According to The Ambient, Apple Home showed three presence sensors and the light sensor, while Alexa did not expose the light sensor. Homey offered the Apple Home controls and also allowed flows based on how long presence or absence was detected. Buyers should check the functions available in their chosen system and account for settings configured in the Meross app.
Meross Thread Smart Presence Sensor MS605
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Three Zones, Multiple Platforms
The MS605 pairs PIR motion sensing with mmWave radar, a combination the review says can help detect both movement and continued presence. Its three range-based zones allow automations to respond differently depending on how near a person is. The onboard light sensor adds another possible input, although platform support differs.
The Ambient also noted a bulky, boxy design with a protruding PIR dome. Its hinged stand can be angled, and the sensor attaches with removable sticky Velcro strips. The review describes the setup process as more involved than simpler alternatives, particularly because changing Bluetooth settings requires pressing the device’s button to reconnect.
Platform Support Varies by Feature
The supplied review does not provide a complete compatibility list, nor does it establish that every Matter-compatible hub will expose all MS605 functions. Its platform examples show differences: Alexa did not display the light sensor, while Apple Home did not offer automations based on how long presence or absence lasted. The review also does not give a standardized battery-life measurement; the stated figure of up to three years is affected by activation frequency.
Results may depend on room conditions and sensor placement. The reviewer reported that automatic calibration did not work reliably in their test, but the source does not establish how often other users will encounter that problem or how performance compares across different rooms and interference sources.
Check Your Hub Before Buying
For prospective buyers, the next step is to check whether their chosen smart-home platform supports the MS605’s specific sensors and automation options—not just Matter over Thread in general. Users should also expect to configure the device through the Meross app, press its button when reconnecting over Bluetooth, and test detection zones and timeouts in the room where it will be used.
The review’s conclusion is that the MS605 may suit people willing to tune a sensor for their routines, while those prioritizing a simpler setup may prefer a less adjustable option. The supplied source contains no later firmware update, manufacturer response or follow-up testing, so whether setup performance has changed since the review is not established.
Key Questions
What did The Ambient conclude about the Meross MS605?
The review found it flexible and accurate once set up, but said reliable detection took considerable configuration. It may be a better fit for users willing to adjust settings than for those seeking a straightforward setup.
What can the MS605 detect?
It combines PIR motion sensing, mmWave radar and a light sensor. Its three configurable range zones can be used to trigger different automations at different distances.
Does the MS605 work with every Matter smart-home system?
The review describes it as Matter-over-Thread compatible, but reports that features differ by platform. For example, Alexa did not show the light sensor in the reviewer’s test, so check support for the specific functions you want.
Why does configuring the sensor require pressing a button?
The Meross app uses Bluetooth for setup and settings. According to the review, Bluetooth shuts down to save battery, so the sensor’s side button must be pressed to enable a connection when changing settings.
How long does the MS605 battery last?
Meross’s stated estimate is up to three years from one CR123A battery. The review says actual life depends on how often the sensor is activated; it does not report a measured battery-life result.
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