Protect yourself and your employees from ground faults and open neutral conditions. Rainproof system handles the harshest outdoor environments. Rugged cable and protective housing ensure failure-free operation. Manual test/reset buttons with industrial grade relays instantaneously trip when the energized and return-neutral conductor currents become unbalanced. Reinforced blades and pin provide excellent bend and break resistance. Electrical Accessory Type: GFCI Cord Set; For Use With: Indoor/Outdoor Outlet; Voltage: 120 V.