UV resistant polycarbonate back, see-through self closing cover and pre-mounted gasket protect against rain, sleet and snow without cracking or breaking. Non-corrosive and non-conductive. Snap-in inserts for flexibility. Moveable hinges mount either horizontally or vertically in vinyl, brick, stucco or concrete. Meets and exceeds UL outdoor low voltage landscape lighting requirements. Meets 1999 NEC Article 210-60 (b) for hotels and motels requiring covered receptacles behind beds, and 2002 NEC Article 406.8 (B) (1) for receptacles in damp or wet locations. Comes standard with three inserts (for a total of 16 different configurations): duplex, decorator and a toggle/five receptacle opening. Receptacle sizes are: 1.25 in (31.75mm), 1.375 in (34.