Behringer FCV100 stereo-volume-pedal for keyboards, expression pedal function,adjustable minimal volume, attention: pedal works only with 9V batterie or 12V DC power supply ! (batterie and power supply not included), power supply optional: Thomann NT1215 (#188460), input impedance 300 kOhm, output impedance 560 Ohm, power consumption 7mA, dimensions in mm 150 x 130 x 60, weight 650g, (impedance poti 50kOhm)