This is a ceiling-mounted passive infrared detector, a passive infrared sensor and a precise spherical lens to cover 360 °of detection Angle, with advanced control processing technology, has excellent detection performance and ultra-low false alarm rate, its performance far exceeds the market of the same price detector. At the same time, the detector also provides a NO/NC output selection mode, which can be directly used to activate the CCTV system and access control system, and the detector can be applied in a variety of indoor occasions, such as warehouses, hotel rooms, offices, etc.