This listing is for a USED-Boss ML-2 Metal Core Distortion Effect Pedal, w/ Power Supply. This pedal has been used before but everything still works great on it. There is a generic power supply added in with the purchase that has been tested with the pedal and works. Otherwise you can put a 9V battery in it but remember to unplug the guitar every time you use it or the battery will die fast. Please take a look at all the photos for a better look at the effect pedal.