Turn lights on and off with the Enerlites WOS15-K IV 3-Wire Passive Infrared Wall Switch Occupancy Sensor. When an individual enters the room, the sensor automatically turns the lights on. When there is no more movement in the room and a set amount of time passes, the lights will then automatically go off. If a user turns the light on/off at the switch, it will remain on/off until returned to "auto." Adjustable time delay and motion sensitivity make the Sensor very customizable. The 3-Wire version of the Sensor means there is no need for a neutral.