WattStopper® Ultrasonic wall switch sensor can turn lights off and on based on occupancy. It is characterized by high sensitivity to small and large movements, appealing aesthetics and a variety of features. High sensitivity for exceptional performance. Low profile design. Selectable operation, walk-through, test and presentation modes for increased energy savings and convenience. Defaults to manual-on operation for maximum energy savings. Part of a comprehensive line of PIR, Ultrasonic and Dual Technology wall switch sensors. Load: 120 VAC, 0 to 800 W ballast or tungsten, 1/6 HP and 277 VAC, 0 to 1200 W ballast.