WattStopper's CX-100 Series Passive infrared (PIR) Ceiling/Wall Sensors detect occupancy to control lighting in a wide variety of applications. These sensors provide superior coverage and performance while also providing great energy savings. CX-100 Series Sensors are 24 VDC and control lighting systems through Watt Stopper power packs. Utilizing the latest PIR technology, they turn lights on when a difference is detected between infrared energy from a human body in motion and the background space. After the area is vacated and the time delay elapses, lighting automatically turns off.