Introduction: Based on the principle of Doppler radar, the detection of motion, fretting and static can be realized. This product is positioned for the application of hand sweep induction scene, which can realize the start of electrical appliances and the space coverage of home environment based on the judgment of hand sweep, and can be independently sensed. Ceiling-mounted application has the ability of sensitive detection (optional), so as to realize the combination of people and environment in the home environment and create a perfect life