Wiring Device-Kellems, ATU2000CL, Occupancy Sensor, 1-Circuit Adaptive Dual Technology, 120/277 V AC, 20 A, Ultrasonic Sensor, 2000 sq-ft Coverage, 360 deg Viewing, 8 to 40 min Adaptive, 8 s Test Time Delay, Incandescent Lamp, 50/60 Hz Response, Screw Terminal Connection, Ceiling Mounting, 32 to 104 deg F, ABS, White, 4.5 in Dia x 3.4 in H Dimensions