The PIR33is a 360° PIR Sensor adopts a sensitivity detector and integrated circuit. It gathers automatism, conveniently and safely saving energy with practical functions. Is designed to automatically turn lights on when motion and body heat is detected. It utilizes the infrared energy from humans as a control-signal source; it can start the load at once when one enters the detection field. It can identify between day and night, easy to install and has a wide variety of uses.