Hubbell Wiring Device-Kellems commercial / industrial grade GFCI receptacles connect electrical equipment to the electrical grid while protecting personnel from shock hazards in wet and damp locations. The patented AUTOGUARD self-test technology automatically monitors ground fault circuit interrupting functionality every 3 hours or less and disconnects power to the receptacle if critical components are damaged & GFCI protection is lost. These receptacles feature a shutter with an LED indicator (green & red) for tamper-resistance. They have nylon construction and brass contacts for impact resistance and durability. These devices are integrated with an internal back wiring clamp and guide pocket to allow back wire installation. Selected models feature a night light to verify power availability, an alarm to alert when circuit protection is no longer functioning and also feature isolated ground mechanism for eliminating electromagnetic noise that can affect sensitive electronic or audio equipment. Choose from a wide range of these 15 / 20A, 125V receptacles, available in grey, ivory, white, black, brown, almond, light almond, red and yellow colours.