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Constructed with Impact-Resistant Nylon Cover Advanced Electronics Offers Superior Resistance to Surges and Over-Voltages Green LED Indicator Light; When Illuminated, it Indicates Power is Present Solid Brass Locking Pins for Strong, Secure Connection Between Receptacle and Wiring Module Built-In-End-Of-Life Identification. If the SmartlockPro Receptacle can no Longer Provide GFI Protection, it will not Reset and no Power is Supplied to the Face