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