The MXR CSP104 '73 Vintage Distortion+ is a reissue/limited edition that replicates the "Distortion Plus" made famous by Randy Rhoads, staying true to the original specifications of the time, with meticulous attention to hand-built construction and even the color of the enclosure. It offers superb sound thanks to its simple circuit. Power is supplied only by a 9V battery. [Functionality Confirmed] *This item was part of a collection. It is being sold to organize equipment. It has been modified to be used with an AC adapter. You can use batteries by removing the plug.