Lutron LOS-CDT-2000R-WH 20-24VDC Dual Technology Ceiling Mount Sensor Self-Adaptive Sensors Automatically Adjust Sensitivity and Timing Passive Infrared (PIR), Ultrasonic (US) or Dual Technology (DT) Range from 450 sq. ft. to 2000 sq. ft. Mounted on an 8 ft. to 12 ft. Ceiling 8-Second Test Mode to Easily Confirm Proper Operation Model with Additional Output (Dry Contact Closure) Available Non-Volatile Memory (Saved Changes are Stored During Loss of Power) 20-24 VDC, Class 2 (PELV) Low-Voltage Wiring Finish: Gloss