Lutron's Radio Powr Savr LRF2-OCR2B-P-WH ceiling-mount occupancy sensor uses passive infrared sensors that automatically control the lights in an area. These sensors detect heat from occupants moving within an area to determine when the space is occupied. It comes in three settings: Auto-On/Auto-Off, Auto-On Low-Light/Auto-Off, and Manual-On/Auto-Off. The sensors then transmit radio frequency signals to dimming and switching devices to turn the lights on or off. It runs on 3 volts of direct current supplied by one CR123 Lithium battery. This white ceiling sensor uses XCT Technology for fine motion detection and is ideal for office spaces, bathrooms and children's bedrooms. Save energy with the easy-to-install Lutron LRF2-OCR2B-P-WH.