NUX OD-3 Overdrive Guitar Electric Effect Pedal Ture Bypass Green Delivers that warm, natural tube overdrive sound. By rotating the knobs you can boost the guitar amp for colorful tone or overdrive itself for unique pedal sound. True bypass design, minimizes tone loss and get more control of your pedal. Aluminum alloy housing, good durability. LED indicator shows status of effect and battery condition. The pedal can be powered by 9V battery or AC 9V adapter.