Red Witch Pentavocal Tremolo, Analog tremolo effect pedal with 5 selectable sound modes, Controsl for tremolo speed, volume, bass/treble mix, Footswitch for effect on/off, footswitch for soft or hard tremolo, True Bypass, Status-LED pulses in speed of effect, 6.3 mm in and outs, runs on 9V battery or optional power supply (# 108096, not included), 2.1 mm barrel plug, polarity: (-) center, Dimensions (W x D x H): 118 mm x 94 mm x 38 mm, Weight: 388 g