Digitech DOD 440 Envelope Filter, effectpedal for e-guitar and bass, envelope filter and auto-wah, analog, classic funk sound reacting to picking dynamics, 2 sound types classic and bass, controls for filter sensitivity and Filter-Sweep, true bypass, light aluminum housing, power via 9V battery or 9V DC power supply #108096 (not included), dimensions (LxWxH): 117 x 63 x 57mm.