Wiring Device-Kellems, ATD2000CRP, Occupancy Sensor With Photocell and Relay, Adaptive Dual Technology, Series: ATD, 24 V DC, 33 mA, Passive Infrared/Ultrasonic Sensor, 2000 sq-ft Coverage, 360 deg Viewing, 8 to 40 min Adaptive, 8 s Test Time Delay, Lead Wire Connection, Ceiling Mounting, 32 to 104 deg F, ABS, White, 4-1/2 in D x 1-1/2 in H Dimensions