Always SafeThe GFCI plug is provided with the functions of auto-monitoring, surge withstanding, dustproof, weather-resistance, operating supply indication, and the like. Features low power consumption and long service life. Made by non-conductive fire-resistant PC materials, the rugged design can be used both indoors and outdoors including in high temperatures, humidity, and other harsh environments. ETL Listed Patented Self-Test Every 5 SecondsThe GFCI adapter automatically conducts a self-test (auto-monitor) every 5 seconds to ensure the GFCI adapter is continually working to protect people from electrocution, which exceeds the ETL standards of self-test frequency of 3 hours Compact SizeThis GFCI adapter is small in size, makes it perfect for the toolbox, and offers portable electric safety protection for users and devices whenever needed Easy to UseEasily see that power is available with the "power on" indicator light Manual Reset & Wide ApplicationTh