Lightcloud Daylight Solar Powered Wireless Sensor - White Finish - 120V-277V VAC - Line of Sight: 1000 ft - Obstructions: 100 ft - Can dim or shut off electric lighting when sunlight is sufficient to achieve your desired lighting level - Light sensor turns off or dims electric lighting when natural light is sufficient - Works in any space with a window or skylight - Stop overlight and start cutting your utility bill - Daylight harvesting saves up to 40% on energy costs from lighting - Designed to maximize utility company rebates - UL Listing: Indoor use only - Mounting: Must be exposed to sunlight, ideally direct, and within wireless range of another Lightcloud device