The DSW-301 Dual Technology Wall Switch Occupancy Sensor turns lights OFF and ON based on occupancy. It combines the benefits of passive infrared (PIR) and ultrasonic detection technologies. The DSW-301 replaces existing wall switches and fits behind a standard decorator wall plate.FEATURES AND BENEFITS:- High sensitivity and dense coverage for exceptional performance- Allows multi-way control from one of up to four control locations- Color-matched lens and low profile for appealing design- Optional neutral connection with break off tab to expose neutral terminals120/277VAC and 347VAC models- Defaults to Manual-On operation for maximum energy savings