Provide electric shock protection and prevent the risks of electrical fire caused by ground fault. Provides continuous ground fault protection - detects and trips actual ground faults even when nothing is plugged into the GFCI outlet. GFCI receptacle is different from conventional receptacles. In the event of aground fault, a GFCI will trip and quickly stop the flow of electricity to prevent serious injury.Patented lockout action prevents reset if GFCI is damaged and cannot respond to a ground fault. Green LED indicator should always be ON. Only if GFCI is malfunctioning, the Green LED indicator will turn OFF. When the TEST button is pressed, the flow of electricity should be stopped, and the RESET button would be pop-out. To restore power, press the RESET button. Provide ground fault protection in bathrooms, kitchens, and any wet area of the house, but keep the plug dry.The merchandise designed to keep away from electrical shock at home. Operating Temperature: -35 to +66