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