Aqara has introduced the FP400, a new type of presence sensor that uses radar technology instead of cameras to track people in a room. This device can monitor up to ten individuals at once, without capturing visual images, making it a privacy-conscious option for smart home systems. The sensor uses advanced 60 GHz radar technology combined with a 4T4R MIMO antenna, which allows it to gather five times more data than previous models. This increased data collection enables the FP400 to divide a room into zones as precise as 50 centimeters, with support for up to eight personalized areas—like a couch or a dining table—each treated separately for monitoring purposes. One of the key features of the FP400 is its ability to detect falls, which is especially useful for elderly individuals living at home. The sensor can also interact with other smart devices, such as adjusting the brightness of living room lights when someone is sitting on the couch between 9 p.m. and 11 p.m. It can even automatically lock doors if they are connected to a compatible smart lock. For those who rent out their homes through platforms like Airbnb, the FP400 includes an over-occupancy alert that notifies the property owner when the number of people in the space exceeds a set limit. To use the FP400's full range of features, a compatible Aqara hub, such as the Hub M3 or M200, is required. Without a hub, the sensor functions as a basic occupancy detector, even if connected to a third-party system like Matter. While the device does not use a camera, it still collects detailed data about the number of people, their posture, and their movements. However, Aqara's documentation is somewhat unclear about what happens to this data after it is processed by a connected hub and how long it is stored. Priced at 90 euros per unit, the FP400 is an advanced option for those looking to enhance their home automation systems. However, buyers should be aware that the full functionality of the sensor depends on additional hardware, and the privacy implications of the data it collects remain partially unspecified.