Cooper Wiring OS310U-V-K Motion-Activated Occupancy Sensor Wall Switch, IvorySAVANT Occupancy Vacancy Sensor Switches use advanced Passive Infrared (PIR) technology to sense the movement of heat emitting bodies. Occupancy Sensors provide Auto on Auto off or Manual on Auto off operation while Vacancy Sensors provide Manual on Auto off operation only (CA Title 24 Compliant). The sensors automatically turn lights off after a space becomes vacant and a preset time delay elapses. Both versions provide single pole (single location)