WattStopper® Passive infrared (PIR) wall switch sensor turns lighting or fan loads on and off based on occupancy and ambient light level. The sensor replaces existing wall switches and fits behind a standard decorator wall plate. 180. coverage, maximum of 900 sq-ft shallow (1 inch) back housing and flying leads for easy installation. Built-in light level sensor. Optional neutral connection with break off tab to expose neutral terminals. Button provides positive tactile feedback. Load: 120 VAC, 0 to 1000 W ballast, LED, tungsten, 1/6 HP. 277 VAC, 0 to 1200 W ballast, LED, 1/6 HP.