Aqara Multi-Sensor FP400 Review: Not Quite the mmWave of the Future
The Aqara Multi-Sensor FP400 is an $80 mmWave sensor that uses high-frequency radio signals to detect human presence and breathing, allowing for precise smart home automations. While it improves on its predecessor by tracking up to ten people and supporting Matter, Thread, and Zigbee, it lacks battery power and the posture detection features initially promised. Reviewers describe the device as a fun but flawed gadget that offers only modest improvements over the three-year-old FP2 model.
- ▪The FP400 can track up to 10 people simultaneously and uses mmWave technology to detect subtle movements like breathing.
- ▪The device requires constant power via a USB-C cable and does not have a built-in battery.
- ▪Aqara confirmed that posture detection features will not be included in the consumer FP400 but are planned for a future FP400 Pro model.
- ▪The sensor supports Matter, Thread, and Zigbee protocols and does not require an internet connection for daily operation.
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| Original publisher | Gizmodo |
| Canonical URL | https://gizmodo.com/aqara-multi-sensor-fp400-review-not-quite-the-mmwave-of-the-future-2000804454 |
| Publication time | Sun, 20 Sep 2026 12:30:57 +0000 |
| Retrieval time | 2026-09-20T12:33:46.371Z |
| Last seen | 2026-09-20T12:33:46.371Z |
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Opening excerpt (first ~120 words) tap to expand
One of the promises of the smart home is total automation that lets your body be a trigger for getting things done. Lights that illuminate when you enter a room and reliably blink off when you leave, perhaps, or a stereo that only turns on when you sit in a specific chair. That’s actually something you’ve been able to do in recent years, thanks to mmWave sensors like Aqara’s new $80 Spatial Multi-Sensor FP400. Unlike simple passive infrared (PIR) motion and occupancy sensors, mmWave devices can precisely detect whether a person is in the room, even if they’re not moving.
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