SafeLock™ Protection: if critical components are damaged and ground fault protection is lost, power to receptacle is disconnected. Prevents line-load reversal miswire: no power to the face or downstream receptacles if wired incorrectly. Exceeds UL943 voltage surge requirements; survives 100x the required UL 3kA/6kV voltage surge test cycles. FSUL Listed (Federal Specification WC596). Trip indicator light (red LED). Side or internal screw-pressure-plate back wire with #10 - #14 AWG solid or stranded copper wire. Two back wire holes per terminal. Ground screw has a back wire clamp for easy installation. 1/4 inch thinner than competitors’ GFCIs; leaves more room for wires in the box. Mounting screws are shipped captive in the device and wall plate for easier installation. High-impact-resistant thermoplastic construction. Extra-long strap. Button colors match the device face. Dual-direction test and reset buttons. Class A rated GFCI. Supplied with matching TP26 nylon wall plate. Tri-drive screws. GFCIs with auto-ground assure a positive ground to metal box. 10kA short circuit rating.