For use with Auxiliary Rheostat Box (B12). Consists of 12' wire with one end an inline 1/4" phone jack which will accept 1/4" phone plug from the Auxiliary Rheostat Box. One the other end of the wire are 2 battery clips (1 red, 1 black) which can be hooked up to appropriate DC battery. The purpose of this battery hook up is to bring the power from teh battery to the auxiliary rheostat box. The clipcord and footswitch are plugged into the auxiliary rheostat box and the speed of the tattoo machine is controlled by the knob attached to the rheostat.