Eaton's Arrow Hart line of GFCI receptacles ensure electrical shock protection with periodical automatic testing. If no GFCI protection is present, the receptacle will render itself inoperable and a red indicator light will glow notifying the user there is no power and the device must be replaced. GFCIs provide state-of-the-art, dependable electrical shock protection. In addition to being tested to the highest standards to help ensure safety, Arrow Hart GFCIs will deny power and prevent re-setting if the device is no longer able to provide safe, protected power.