UV-Resistant polycarbonate back, see-through cover and pre-mounted gasket protect devices inside from rain, sleet and snow without cracking or breaking. Non-corrosive and non-conductive. Snap-in inserts provide flexibility. 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) - GFCI, duplex/toggle and toggle/four round in these sizes: 1-1/4 inch (31-3/4 mm), 1-3/8 inch (34.925 mm), 1-1/16 inch (41.275 mm) and 1-3/4 inch (44.45 mm). 3-1/4 inch D x 6.445 inch x 5.575 in.