Powered by battery or via 9-volt power supply (sold separately).

Buy at www.musicianscart.com Ampeg Scrambler Bass Overdrive Pedal 990404021  Overdrive Effects Pedal for Bass, with Drive, Blend, Treble, and Volume Controls,Overdrive pedal for electric bass guitar,Blend control allows you to balance your dry fundamental tone with the overdrive,Treble control adds high end to help you cut through,Like having an overdriven Ampeg amplifier on your pedalboard,Powered by battery or via 9-volt power supply (sold separately).