PIR Motion Sensor HC -7B is a very high quality PIR Motion Sensor which adopts good sensitivity and integrated circuit. it gathers automatism, convenience, safety, saving-energy and practical functions. It utilizes the infrared energy from human as control-signal source and it can start the load at once when one enters detection field. It can identify day and night automatically. It is easy to install and used widely. Its unique sleek design is the automatic choice of every automation engineer.