# Meross MS605 Thread Smart Presence Sensor

Meross MS605 is the Meross presence sensor to consider when the wire on the MS600 is the dealbreaker and the home already has reliable Thread coverage. Buy it for flexible placement and direct Matter pairing, but do not ignore the shorter detection range or the Meross hub requirement for Meross-app automations.

Canonical page: https://matterhome.io/devices/meross-ms605-thread-presence-sensor
Markdown page: https://matterhome.io/devices/meross-ms605-thread-presence-sensor.md
Author: Matterhome Editorial Team
Author profile: https://matterhome.io/authors/matterhome-editorial-team
Edited and fact-checked by: JC Martinez
Editor profile: https://matterhome.io/authors/jc-martinez

## Device Facts

- Brand: Meross
- Model: MS605 Thread Smart Presence Sensor
- Product type: Matter-over-Thread Presence Sensor
- Category: Sensors
- Connection: Matter over Thread
- Matter status: Meross sells MS605 as a battery-powered Matter-over-Thread presence sensor that pairs through the Meross app over Bluetooth, then connects to Matter platforms through a compatible Thread border router.
- Launch date: 2025-11-19
- Thread border router required: Yes
- Brand hub required: No
- Typical price range: $35-$106
- Markets: Global
- Review status: Compatibility guide
- Product image: https://matterhome.io/content-assets/devices/meross-ms605-thread-presence-sensor/product.webp
- Product image alt text: Meross MS605 Thread Smart Presence Sensor
- Product image source: https://cdn.shopify.com/s/files/1/0488/4289/9612/files/Smart_sensor_device_MS605MA.png?v=1769503552

## Ecosystem Support

- Apple Home: Supported
- Google Home: Supported
- Alexa: Limited
- SmartThings: Supported
- Home Assistant: Supported

## Best For

- Rooms where a wired presence sensor would be hard to place cleanly
- Thread homes that need battery-powered occupancy detection
- Buyers comparing Meross MS600 against Aqara FP300

## Skip If

- You do not have a Thread border router
- You need the longer detection range of a powered presence sensor
- You expect Alexa to use the light sensor in routines

## Setup Notes

- Pair and configure the sensor through the Meross app over Bluetooth, then add it to the Matter platform that will run the automations.
- Confirm that the chosen Matter hub supports both Matter and Thread before buying.
- Test the detection zones, light reading, and no-presence timing before mounting it permanently.

## Known Limitations

- Meross says motion detection reaches up to 6 m and presence detection reaches up to 4 m, which is less than the wired MS600.
- Alexa currently does not support the light sensor, according to the Meross product page.
- Meross-app automations require a Meross Hub, which Meross says is expected in 2026 Q3.
- Battery life depends on traffic and reporting behavior, so busy rooms may drain the CR123A battery faster than quiet rooms.

## Pros

- Battery-powered Matter-over-Thread presence sensing
- Combines millimeter-wave radar, PIR motion, and light sensing
- IP67 housing and adjustable wall, ceiling, or corner mount
- Meross hub is not required for the direct Matter path

## Cons

- Requires a Matter controller with Thread border router support
- Shorter range than the wired Meross MS600
- Meross-app automations need a separate Meross hub path
- Alexa currently does not support the light sensor

## Sources

- https://shop.meross.com/products/thread-presence-sensor-ms605
- https://www.theverge.com/news/823265/meross-matter-thread-smart-presence-sensor-ms605-radar-mmwave
- https://cdn.shopify.com/s/files/1/0488/4289/9612/files/Smart_sensor_device_MS605MA.png?v=1769503552

## Battery placement is the reason to look at it

Meross MS605 answers the main complaint about the MS600: the cable. It keeps the same broad idea of presence sensing, with radar, PIR motion, and ambient light in one small sensor, but moves to a CR123A battery and Matter over Thread.

That makes placement easier. A bathroom, study, hallway corner, or covered outdoor-adjacent spot can make more sense when the sensor does not have to sit near USB power. The tradeoff is range. Meross lists motion detection up to 6 m and presence detection up to 4 m, while the wired MS600 is the better fit when the sensor has to watch a larger room.

## Matter is direct, but setup still starts with Meross

For third-party smart home apps, MS605 needs a hub that supports both Matter and Thread. That means a Thread-capable Apple Home, Google Home, Alexa, SmartThings, Home Assistant, or similar Matter setup has to be in place before the sensor is useful.

Meross still matters at setup. The official page says the device pairs through the Meross app over Bluetooth, then connects through a compatible Thread border router for local Matter control. A Meross hub is not required for that direct Matter path, but Meross says automations inside the Meross app require a Meross Hub expected in 2026 Q3. That distinction is important: Matter users can skip the Meross hub, but Meross-app users cannot treat the sensor as fully independent.

## What to verify before mounting

Presence sensors are placement-sensitive, and a battery sensor does not remove that work. Test the sensor where people actually sit, stand, or pass through. Check whether fans, curtains, pets, robot vacuums, or HVAC movement cause false presence before using adhesive or a high ceiling mount.

The light sensor also needs an ecosystem check. Meross says Alexa currently does not support the light sensor, and Matter platforms can expose sensor details differently. If the automation depends on brightness, buy one first and confirm the exact trigger before ordering a multi-pack.

## Should you buy it?

Buy MS605 if you already have Thread coverage and the room needs presence sensing where a cable would look bad or fail to reach. It is a practical alternative to Aqara FP300 when Meross' app flow, pricing, or multi-zone claims fit your setup.

Skip it if you are still missing a Thread border router, if the room is large enough to favor the wired MS600, or if your planned routine depends on a light sensor that your ecosystem does not expose. Battery presence sensing is useful, but it is not a shortcut around range, placement, or platform testing.