Electro Harmonix Micro POG
Electro Harmonix Micro POG, Polyphonic Octave Effects, Control for Octave, Sub Octave, Octave Up, Turns a 6-string guitar into a 12-string, Turns a 4-string bass into an 8-string, Dimensions (WxDxH): 102 x 121 x 57 mm, Includes power supply (96 DC 200 BI)