Full metal shell, durable and exquisite. 3 controlling knobs (Oct1, Oct2, Dry) and 1 mode switch for accurate adjustment. Oct1 knob: Adjust the volume of the first octave voice. Oct2 knob: Adjust the volume of the second octave voice. Dry knob: Adjust the volume of dry signal. Mode switch: Switch between top (+1 OCT and +2 OCT), both (-1 OCT and +1 OCT) and bottom (-1 OCT and -2 OCT) mode. Output jack: 1/4 inch mono audio jack for signal output. Input jack: 1/4 inch mono audio jack for connecting guitar. True bypass footswitch and lever designed to prevent stamping on operation knobs. Material: Aluminium Alloy. Input Impedance: 470K Ohms. Output Impedance: 100 Ohms. Current Draw: 68 mA. Power supply: AC Adapter 9V DC (not included). Note: Please use the 9V power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly. Item Size: 9 * 3.8 * 4.8cm / 3.5 * 1.5 * 1.8in. Item Weight: 151g / 5.3oz. Color as shown. Package List: 1 * Guitar Effect Pedal, 2 * Adhesive Tape, 1 * User Manual (English Chinese), 1 * Hardcover Box