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The Ambient reviewed Meross’s MS605, a battery-powered presence sensor that combines PIR motion detection, three mmWave detection zones and a light sensor, with Matter-over-Thread support. The review found it responsive and accurate after configuration, but said setup can be fiddly and features vary across smart home platforms.
The Ambient’s review of the Meross Thread Smart Presence Sensor MS605 found a capable but sometimes frustrating smart home device: it combines PIR motion sensing, three mmWave detection zones and a light sensor, but required substantial configuration to detect presence reliably. The sensor connects to compatible smart home systems through Matter over Thread, though what users can do with its readings depends on the platform.
The MS605 is powered by a single CR123A battery, which Meross says can last up to three years; actual life depends on how often the sensor activates. Its hinged stand allows users to direct the sensor, and the device can be attached with removable sticky Velcro strips. The reviewer described its body as bulky and boxy compared with some competing presence sensors.
To configure the device, users connect it to the Meross app over Bluetooth, even though it is designed to work with smart home platforms using Matter over Thread. Bluetooth shuts down to conserve battery power, so the reviewer said users must press a button on the sensor each time they want to change settings. The app offers automatic calibration, false-trigger logging and manual sensitivity adjustments for the three range zones. Users can also change the order in which PIR and mmWave sensing are used, or disable PIR.
The reviewer reported that the MS605 responded quickly and accurately once configured, but said automatic setup did not reliably resolve interference in their experience. Platform support was not identical: Apple Home displayed three sensors and the light reading, while the light sensor did not work in Alexa. Homey offered presence-duration controls through Flows, but timing settings in both the Meross app and Homey could add together and delay an automation.
Setup Shapes Everyday Automation
The review highlights a practical trade-off for buyers: the MS605 offers multiple detection zones and more tuning options than a basic motion sensor, but those controls can take time to configure. Separate zones can support different actions at different distances—for example, switching on room lighting when someone enters, then activating another device when they move closer.
Matter over Thread compatibility gives the device a route into several smart home ecosystems, but the review’s platform tests show that compatibility does not guarantee identical features everywhere. Buyers choosing a sensor for a particular automation should check whether their platform exposes the light reading and the timing controls they need. The extra configuration may suit users who want fine control; those seeking a quick, straightforward setup may prefer a simpler option.
Meross Thread Smart Presence Sensor MS605
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How the MS605 Is Configured
The MS605 combines passive infrared (PIR), which detects movement, with mmWave radar, which can help detect continued presence even when a person is relatively still. It also measures light levels. The review describes the device as three configurable motion sensors, divided by detection range, as well as a light sensor.
Although the sensor uses Matter over Thread for smart home connectivity, its initial setup and detailed adjustments are made in the Meross app over Bluetooth. The reviewer says the app’s automatic mode is intended to account for sources of interference such as fans or air conditioning. If calibration is inaccurate, the app allows users to flag false positives in a log and change sensitivity and timing settings manually.
““In practice, it took quite a bit of configuration to make the sensor work reliably.””
— The Ambient review
Platform Support Varies
The review does not establish that every MS605 will require the same degree of tuning. Detection can depend on room conditions, interference and individual sensitivity settings, and the source reports the reviewer’s experience rather than controlled results across multiple homes. It also does not provide a full comparison of platform behavior beyond Apple Home, Alexa and Homey.
Feature availability differs by platform in the review’s tests: the light sensor appeared in Apple Home and Homey, but not Alexa. The source does not specify whether software updates could change those differences. Battery life is also an estimate from Meross, not a measured result in the review; usage frequency affects how long the CR123A battery lasts.
Check Your Platform Before Buying
Readers considering the MS605 should verify which readings and automation controls their intended smart home platform supports, then account for the need to configure the device through the Meross app and Bluetooth. The review does not identify a forthcoming firmware update, product revision or additional testing milestone. Its practical conclusion is that the MS605 can provide responsive, configurable presence detection, but buyers should expect to spend time adjusting it and should not assume every platform exposes all of its features.
Key Questions
What sensors does the Meross MS605 include?
The MS605 combines PIR motion sensing, mmWave presence detection with three configurable range zones, and a light sensor.
Does the MS605 work with Matter?
Yes. The device supports Matter over Thread, according to the review. Initial setup and detailed configuration still require the Meross app over Bluetooth.
Was the MS605 reliable in the review?
The Ambient reviewer said it was fast and accurate after configuration, but found that getting reliable detection took considerable adjustment. Automatic calibration did not work well in the reviewer’s experience.
Do all smart home platforms support the same MS605 features?
No. In the review’s tests, Apple Home showed the light sensor, Alexa did not, and Homey provided presence-duration automation controls. Available features depend on the platform.
How long does the MS605 battery last?
Meross says its single CR123A battery can last up to three years. The review notes that actual battery life depends on how often the sensor activates; it does not report a measured battery-life test.
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