Apollo MSR-2 Review: An LD2410 mmWave Presence Sensor Built for Home Assistant
Radar presence detection plus a light sensor over Wi-Fi, aimed squarely at local automations rather than voice assistants.
The Apollo MSR-2 is a compact mmWave presence sensor built on the LD2410 radar module, designed to tell a room whether someone is actually in it rather than whether something just moved. It pairs presence detection with an ambient light reading, runs on USB-C over 2.4 GHz Wi-Fi, and integrates with Home Assistant, which is the only supported platform. For anyone tired of lights switching off while they sit still, that combination is the whole point. It does not do multi-person tracking, fall detection or sleep monitoring, so treat it as a presence and light sensor rather than a full radar suite.
- Home Assistant users
- Occupancy-based lighting
- Desk and sofa automations
- Replacing PIR sensors
Pros
- mmWave presence detection catches people who are present but still
- Built on the well-known LD2410 radar module
- Ambient light sensor for smarter lighting rules
- Presence alerts and automation support
- History records for occupancy patterns
- Simple USB-C power
- Native Home Assistant integration
Cons
- Home Assistant only: no Alexa, Google Home, HomeKit, SmartThings, IFTTT or Matter
- No multi-person detection
- No fall alerts or sleep monitoring
- Detection range, angle and area are not documented
- Wired over USB-C with no battery option
- Indoor only, with no weather resistance rating
Who is the Apollo MSR-2 for?
It is for the Home Assistant user solving the classic PIR problem: a passive infrared sensor only sees movement, so the lights go out while you read, work or watch television. mmWave radar detects a person who is present but still, which is what makes presence-based automations feel reliable instead of annoying. Home Assistant is the only supported platform here, so this is a device for local automation rather than for Alexa or Google Home routines.
What the MSR-2 does
Two readings drive everything. Presence detection, from the LD2410 mmWave radar, reports whether the space is occupied and can raise presence alerts to trigger automations. The ambient light sensor adds the other half of a good lighting rule: turn the light on when someone is present and it is actually dark, rather than at midday. History is recorded, so occupancy patterns stay visible over time, and automations are supported directly. Power is USB-C, so it can run off a phone charger or a USB port near where it is mounted.
What to know before you buy
Home Assistant is the only integration: Google Home, Alexa, Apple HomeKit, SmartThings, IFTTT and Matter are all unsupported. On the radar side, this is single-target detection, with no multi-person tracking, no fall detection and no sleep monitoring, so it will not count people in a room or watch over an elderly relative. The detection area, angle and range are not documented for this model, which matters because mmWave sensors are very placement-sensitive: expect to spend time positioning it and tuning thresholds. It is a wired device on 2.4 GHz Wi-Fi with no battery option, and it has no weather resistance rating, so it stays indoors.
Is the Apollo MSR-2 worth it?
It sits at a modest price for what mmWave sensors typically cost, and it targets the one automation everybody wants to get right. If you run Home Assistant and have a room where the lights keep dying on you, it addresses that directly and adds the light reading you need to do it properly. If you want Alexa or Google Home support, or you need multi-person or fall detection, this is not the sensor to buy.
Frequently asked questions
How is the Apollo MSR-2 different from a motion sensor?
It uses mmWave radar rather than passive infrared, so it detects a person who is present but not moving. A PIR sensor only reacts to movement, which is why PIR-driven lights switch off while you sit still.
Does the MSR-2 work with Alexa or Google Home?
No. Home Assistant is the only supported platform.
Can it track more than one person?
No. Multi-person detection is not supported, and neither is fall detection or sleep monitoring.
Does it have a light sensor?
Yes. Alongside presence, it reads ambient light, which lets automations account for how bright the room already is.
How is it powered?
Over USB-C, on 2.4 GHz Wi-Fi. There is no battery option, so it needs to be mounted within reach of a USB power source.


