W216S PIR sensor is a type of anti- WiFi. It is widely used for Security system, Doorbell, IP Camera, Lighting, home application. The product is a type of intelligent PIR sensor which integrates digital control. PIR sensor sense the motion object, always used to detect the human. There is a detect range for the PIR sensor. When a people move in or out of the detect range, the PIR sensor will be triggered. PIR sensor are low-power, small, easy to used. For this reason it can be used for the alarm system and lighting control. PIR sensor also named passive infrared, Pyroelectric or IR motion sensor.