The DT-305 Series Dual technology Ceiling Sensors combine the benefits of passive infrared (PIR) and ultrasonic technologies to detect occupancy. Sensors have a flat, unobtrusive appearance and provide 360 degrees of coverage.FEATURES AND BENEFITS:- Product Environmental Profile- Architecturally appealing low-profile appearance- Auto set automatically selects optimal settings for each space- Walk-through mode increases savings potential- Ultrasonic diffusers give more comprehensive coverage- Plug terminal wiring for quick and easy installation- Accepts low-voltage switch input for manual-on operation- Automatic or manual-on operation when used with a BZ-150 Power Pack