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The Ambient reviewed Aqara’s Spatial Multi-Sensor FP400, a powered mmWave sensor that can track up to 10 people and provide as many as eight configurable motion zones. The review found it accurate and straightforward to set up, but said its high price and need for continuous USB-C power make it less flexible than battery-powered alternatives.
The Ambient’s review of the Aqara Spatial Multi-Sensor FP400 finds that the USB-C-powered mmWave device can track up to 10 people and divide a room into as many as eight motion zones. The reviewer reported accurate detection and guided setup, while identifying the sensor’s high cost and constant power requirement as key limits for buyers.
The FP400 is designed to detect presence and movement rather than simply register that something moved. In The Ambient’s test, it identified the reviewer entering an office and placed them correctly on the room map. The reviewer also sat still at a desk for several minutes and remained registered, a use case where a conventional motion sensor may stop detecting activity. The supplied source does not include the remainder of the performance test, so no further test results can be confirmed here.
In the Aqara app, users can map the room and add up to eight separate zones, such as areas around a sofa or chair. Those zones can appear as separate motion sensors in supported platforms, allowing routines to respond to activity in a particular area. The review describes possible uses such as switching on a reading light when someone sits in a chair or turning off a fan after a person leaves the sofa. These are automation examples, not reported test outcomes.
The device supports Zigbee or Thread and can connect with Matter. The review says Thread can let users connect through a compatible hub without an Aqara hub, but with fewer features. For the fuller feature set, The Ambient recommends pairing through an Aqara hub and sharing the device with other systems through Matter. The reviewer used an Aqara M200 hub and bridged the sensor to Apple Home and Homey.
Room-Level Tracking Adds Automation Options
The FP400’s appeal, according to the review, is that one sensor can supply more specific occupancy information than a basic motion detector. Rather than triggering a routine whenever there is movement anywhere in a room, its zones can let compatible smart-home systems react to activity in selected areas. This may be useful in larger or more complex rooms where a single broad occupancy signal is not enough.
That flexibility comes with practical trade-offs. The FP400 needs continuous USB-C power, and Aqara includes a cable but not a power adapter. Owners must plan around an outlet and cable route, which can make placement harder than with battery-powered sensors. The Ambient also characterizes the device as expensive, but the supplied material gives no price, so a specific cost comparison cannot be made.
Platform support also affects what the sensor can do. The review says Apple Home can use occupancy detection and the light-level reading to trigger routines. Homey offers those options and can also add a delay before a routine runs. Although the FP400 can count people in a room, the review says that count is not exposed as a trigger to other platforms. Buyers should distinguish the sensor’s capabilities in Aqara’s own app from the controls available in their chosen smart-home system.
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How Aqara Sets Up the FP400
The FP400 can be mounted on a wall or ceiling. Its included stand can be extended and angled, while a magnetic mounting base can be screwed or stuck in place. Aqara recommends an installation height of 150 to 200 centimetres. A corner installation is also possible, but the review says it requires an optional corner mount; the kit version includes it.
Setup through the Aqara app includes guidance for positioning the sensor and a routine in which the user walks around the room boundary to define the detection area. The app also offers an AI setup that takes about 30 seconds and requires the room to be empty, according to the review. The reviewer described the setup as smoother than their experience configuring the Meross Thread Smart Presence Sensor MS605.
Users need to choose between Zigbee and Thread when setting up. According to The Ambient, changing protocols requires a firmware change and resetting the sensor, followed by a new setup. This makes the initial choice relevant, particularly for households weighing Aqara’s richer hub-based feature set against a Thread connection to a compatible hub.
“Tracks up to 10 people”
— The Ambient review
multi-zone motion sensor for smart home
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Price and Platform Limits Remain
The supplied source does not state the FP400’s price, the review’s publication date, or the full set of performance-test results. It describes the product as expensive but does not provide a figure or a direct price comparison. The review also does not establish how reliably the sensor performs across different room layouts beyond the reviewer’s reported office test.
Some features depend on the selected connection and smart-home platform. The review says Thread offers fewer features than using Zigbee with an Aqara hub, and that people-count data is not available as a trigger in other platforms. It does not provide a complete compatibility list or specify whether other platforms expose the same zone controls as Apple Home and Homey. Buyers should check current platform support before relying on a particular automation.
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Check Fit Before Buying
The review does not announce a firmware update, release milestone, or other next development. For prospective buyers, the immediate next step is to check the current price, compatibility with their hub and preferred smart-home platform, and whether their planned mounting location can reach USB-C power. Those factors determine whether the FP400’s multi-zone detection is worth the added cost and installation constraints.
Anyone considering the device for a specific routine should also confirm which sensor readings that platform can use. In particular, the review says room-level people counts are not exposed as triggers in other platforms, while zone-based motion and light-level readings can support routines in the systems it tested.
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Key Questions
What does the Aqara FP400 detect?
According to The Ambient, the FP400 detects presence and motion, can track up to 10 people, and can divide a room into as many as eight configurable motion zones.
Does the FP400 need to stay plugged in?
Yes. The review says the sensor requires constant USB-C power. Aqara includes a cable, but not a power adapter.
Can the FP400 work without an Aqara hub?
The review says it supports Thread and can connect to a compatible hub without an Aqara hub, but with fewer features. For the fuller feature set, the reviewer recommends Zigbee with an Aqara hub, then sharing the device with other systems through Matter.
Can I use the FP400’s zones for smart-home routines?
The review says its configured zones can appear as additional motion sensors in supported systems, including Apple Home and Homey. Available routine options vary by platform, and the review says the room’s people count is not exposed as a trigger in other platforms.
What are the main drawbacks cited in the review?
The Ambient cites the FP400’s high cost and need for continuous USB-C power. The supplied source does not give a price, so buyers will need to check current listings and compare them with battery-powered alternatives.
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