This compact power box is designed to plug into the 4-wire full power outlet on smaller generators. By utilizing this outlet, the user maximizes the output of this unit while also being provided with two separate 20A 125V GFCI protected circuits. Each circuit has its own breaker and GFCI device offering four outlets per circuit. These units are available with either 20A 125/250V or 30A 125/250V plugs.