Rivera Double Shaman, Dual Overdrive, emulates the tonal and dynamic range of a small Class A tube amp, with buttery warmth and soft clipping in its overdrive. This pedal gives you more of a power output stage overdrive which is fat and full bodied, two separate footswitchable channels, each with switchable Combo/Stack tone and gain, tone and level controls, power supply: 9V battery (Item No. 132579 not included) or mains adapter (not included)