The Intermatic IOS-DSR-WH PIR occupancy sensor detects an occupant's presence in an area, sensing the difference between heat emitted by a person and atmospheric heat. It features automatic on/off control and a built-in OCC/VAC slide button for optional manual on/off mode. Self-adaptive feature automatically adjusts time delay based on occupant's behavior patterns. 'Walk-through' sensing mode increases energy savings by turning lights off shortly after momentary occupancy. Designed for use with electronic fluorescent ballasts, this sensor has an white finish and includes a standard decorator wall plate. It is UL/cUL listed, CA Title 24 compliant, and has a two year limited warranty.