Polyphonic octave electric guitar effect pedal, mini single effect with true bypass. Full metal shell, durable and exquisite. 3 controlling knobs (Oct1, Oct2, Dry) and 1 mode switch for accurate adjustment. Oct1: adjusts first octave voice volume; Oct2: second octave voice volume; Dry: dry signal volume. Mode switch options: top (+1 OCT & +2 OCT), both (-1 OCT & +1 OCT), bottom (-1 OCT & -2 OCT). True bypass footswitch with lever design to prevent stamping on operation knobs. Input/output: 1/4" mono audio jacks. Specifications: Polyphonic Octave effect, Aluminium Alloy material, Input Impedance 470K Ohms, Output Impedance 100 Ohms, Current Draw 68 mA. Power supply: AC Adapter 9V DC (not included, please use positive pole outside and negative pole inside). Item Size: 9 * 3.8 * 4.8cm, Item Weight: 151g. Color as shown. Package List: 1 * Guitar Effect Pedal, 2 * Adhesive Tape, 1 * User Manual (English Chinese), 1 * Hardcover Box.