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The idea is to create a USB charging device that will flip open to draw power from electrical outlets already fully occupied.
The device will open to extend a flat conductive "power tab", which will work via its two holes. The prongs of one of the plugs that will be occupying the outlet will be run through the holes and then plugged back into the outlet. The power tab will draw enough energy to charge a mobile device, sending 1 amp through the USB cable.
A flat "power tab" will fold under the device body when not in use.