Pass Seymour® Surge protective duplex receptacle. Isolated ground. A high visibility, wide-angle lens indicates protection is in place. LED Indication steady green is protected, flashing red is not protected, off is no power to unit. Audible alarm alert of MOV damage. Alarm able to be turned on/off. Wrap-around steel strap for structural integrity. Auto-ground is standard, for easier installation. Triple-wipe, copper-alloy contacts for superior, more dependable connection. External screw-pressure-plate back and side wire terminals including ground with external back wire clamps accept 10 to AWG copper or copper-clad, solid or stranded conductors. External pressure plate feature allows two conductors to be terminated by a single screw. Thermal protection in 3 modes. (3) 17 mm dual pack MOVs absorb up to 340 Joules of excess energy in each leg.