The Aqara Presence Sensor FP2 is a smart sensor designed to detect precise human presence using millimeter-wave radar technology. Unlike traditional motion sensors, it can detect even subtle movements, such as breathing, allowing for more accurate automation and security triggers. It can monitor multiple zones in a room and trigger smart home actions, such as turning lights on or adjusting the thermostat, based on presence. The FP2 integrates with platforms like Apple HomeKit and works with other Aqara devices via Zigbee, offering advanced control for smart home setups.