Occupi sensor detects the presence of movement within its given range. The sensor detects motion and transmits the signal to the control unit. If no movement is detected after a period of time set by the user, the controller determines the space is unoccupied and switches off the light.

Occupi sensors are devices that detect when a space is unoccupied and accordingly automatically turn off the lights, thereby saving energy. The device may also turn the lights on automatically upon detecting the presence of people, providing convenience and a potential security aid.