This Precision Lumatrol ET-168 thermal type photocell gives you convenient dusk to dawn control of walkway lights, parking lot lights, and security lights. It features an SPST switch for use with 208-277 volt systems. The stem and swivel mounting make installation easy and the weatherproof Lexan housing features a quick disconnect. Extremely durable, this photocell functions in temperatures ranging between -40 degrees Fahrenheit and 158 degrees Fahrenheit. With a length of 3.5 inches and a depth of 1.375 inches, it has a handy, small profile for use in cramped spaces. Carrying a 5-year warranty and CSA certification, it will provide years of uncompromised lighting control for the home owner. This Precision photocell is the perfect complement to any lighting design.