NICOR Lighting Low Power Occupancy/Motion Sensor with 180-Degree Field Of View, White (DOS180LPWH) Low Power Passive Infrared Motion Sensor Wall Switch Passive Infrared (PIR) Sensor technology uses heat signatures to detect human presence. Operates at 120V~277V Self adaptive feature automatically adjusts time delay based on occupants behavior patterns Walk-through sensing mode increases energy savings by turning lights Off automatically