NSI OSWS series PIR sensor, decorator style in-wall occupancy sensor. Application includes offices and hotels, classrooms, conference rooms, lavatories, hallways. Great for retrofit. Daylighting mode: Adjustable level to keep lights OFF even when occupancy is sensed if adequate light exists in the room from windows or skylights. Manual override: Includes ON and OFF switch. Easy wiring: No neutral required. Contact ratings: OSWS9P-277: 1800W Ballast at 277 VAC . Adjustable time delay: 30 seconds - 30 minutes. Operating temperature: 32 to 131 degrees F (0 to 55 degrees C). Box mount. UL listed.