Guitar pedal effect - Sample and Hold Envelope Filter, auto-wah and voltage controlled envelope filter (VCF), 3 modes: Up Sweep, Down Sweep and Sample & Hold, true bypass, 3 controls for Range, Resonance and Filter, silent relay-based soft touch switching, bypass footswitch, 6.3 mm mono IN/OUT jacks, status LED, metal housing, power supply optional 9V DC adapter (not included), battery operation not supported, dimensions (D x W x H) 117 x 64 x 57 mm