Power-off Protection: Ground Fault Circuit Interrupter provides continuous ground fault protection, break the circuit in just 0.025 seconds when ground fault occurrence in the circuit. LED Indicator: Green - When the wiring is correct and the power is turned on, the green light will be on. Press the "RESET" button and the outlet will enter normal working state. Red - GFCI receptacle reaches the end of its' life. No led - Fault, wiring error, or no power. Wiring: The 15a gfi outlet is designed with side and back wiring - inserting wires, which is a safer design. TIPS: Do not twist the terminal screws out. Do not use power tools to loosen terminal screws. Material: Thermoplastic materials and reasonable structural design ensure electrical safety and fire prevention. Meet high quality standards and safe operation. UL Listed. RESET Button: GFCI outlet with TEST and RESET buttons, allowing periodic testing.