Leviton offers many products that will help lower electrical costs and add convenience to everyday living. By simply replacing standard switches with occupancy sensors reduces energy consumption and extends bulb life. Leviton's Decora® Manual-On Occupancy Sensor Switch complies with California Title 24 by requiring the user to manually turn the lights ON but will automatically turn the lights OFF when a space is unoccupied. It ensures that lights are not left ON unnecessarily for hours at a time. It uses "passive infrared technology" in order to detect human presence in a room, and respond to the infrared heat people naturally emit to monitor a specific area. When this "heat" is sensed, the lights will stay ON in the room, and then turn the lights OFF, when the space is vacated or are unoccupied. Compatible with Decora® screwless snap-on wallplates (sold separately).