The Leviton Decora wall switch occupancy sensor is the ideal energy saving choice to provide automatic (auto on or off and manual on or auto off) lighting control in a variety of commercial and residential applications, including offices, conference rooms, multimedia rooms, child care centers and more. The ODS15 uses passive infrared (PIR) detection technology to monitor a room for occupancy through a segmented Fresnel lens. This specialized lens divides the field-of-view into sensor zones. When a person passes into or out of a sensor zone, the sensor detects motion and switches the lights on. The lights will remain on as long as there is an occupant moving through the sensor zones.