Eaton's GFCI Duplex Receptacles are designed with the safety of the user in mind and are fully compliant with all the latest NEC code requirements. GFCIs provide state-of-the-art, dependable electrical shock protection, and conduct an automatic self-test periodically to ensure the integrity of GFCI protection. The devices incorporate a safety lock-out feature that protects against mis-wired line-load connections that can cause damage to the GFCI circuitry. In addition to being tested to the highest standards to help ensure safety, GFCIs will deny power and prevent re-setting if the device is no longer able to provide safe, protected power. Tamper resistant (TR) receptacles feature a built-in UL listed safety shutter system that prevents the insertion of foreign objects into the receptacle openings. The safety shutters will only open when a two-bladed plug presses simultaneously against the two shutters. Weather resistant (WR) GFCIs feature corrosion resistant hardware and UV resistant materials designed to withstand the elements.