VPL-1 is an active Volume/Boost pedal with two outputs for normal pedal volume and fixed gain. Pedal features two knobs that set the minimum and maximum volume peaks for the expression pedal. VPL-1 can be powered by standard 9V battery or with a 9V center negative power supply (not included). Specs: Power supply: DC9V, Consumption: 14mA(active), 12mA(bypass), Dimension: 95.5(w) x 253(h) x 74(d) (mm), Weight: 1,2kg (include battery)