A wireless power supply and voltage controller for powering and controlling a tattoo machine according to the present invention includes a battery housing having a plurality of walls that, collectively, define an interior area and a rechargeable battery positioned in the interior area of the battery housing. An input selection assembly is positioned on an exterior surface of a respective wall of the plurality of walls of the battery housing, the input selection assembly being operable to generate a speed generation signal. A controller is electrically connected to the input selection assembly that is operable to regulate a quantity of voltage flowing from the battery according to the speed generation signal.
