Lutron LOS-CDT-2000-WH Dual Technology (PIR and Ultrasonic) Occupancy Sensor 2000 Sq-ft 20 - 24 Volt White Self-adaptive sensors for sensitivity and timing Covers 2000 square feet when mounted on 8 to 12 foot ceilings 8-second test mode included Non-volatile memory saves settings during power loss 20 to 24VDC Class 2 (PELV) low-voltage wiring