MXR® CUSTOM BADASS™ MODIFIED O.D. M77 This pedal features a classic overdrive circuit that's been upgraded with a 100HZ control and a Bump switch for improved performance and versatility. This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick™, Iso-Brick™, and Mini Iso-Brick™ power supplies (not included).