This easy-to-use Plug-In GFCI Adapter fits any standard 3-wire outlet and provides instant GFCI protection. It immediately detects ground fault from damaged cords or exposure to water, and shuts-off power to avoid electrocution. Use with wet/dry vacs, electrical lawn mowers, tools, sump pumps, etc. Great Indoor/temporary outdoor protection in the garage, basement, bedroom, yard and deck.