Twice as powerful as Pocket Socket, The Power Box has 20 watts of generation capacity at 120 volts. This is enough to charge low power netbooks, tablets, smartphones, video devices, portable gaming devices, all sorts of stuff! The Power Box can charge multiple devices at one time, for example four smart phones or two tablets. When used with an accessory part, the Power Box can charge a 12 volt battery. A 12 volt battery can be used to store energy and can power certain appliances that the Power Box cannot power directly.