Controls Fluorescent and Incandescent Lighting Systems, HVAC Electrical Equipment, Ventilating and Exhaust Fans, Self-Contained Air Conditioning Units. For use in Offices, Classrooms, Conference Rooms, Lavatories, Motels, Hallways. Units contain built-in powerpack for either 120VAC or 277VAC input. Adjustable timer for delayed turn-off in 30 seconds to 15 minutes after no movement or presence is detected. Manual override ON by inserting key in slot of unit (for emergency use).