Features: Precise polyphonic octave effects with no distorted sound. With 11 different octave modes. Control knobs for adjusting level of , SUB part and UPPER part signals. True bypass footswitch for switching effects and bypass. LED light for indicating effects or bypass status. Full metal shell, durable and sturdy. Specifications: Material: Metal Signal Input: 1/4″Monaural Jack (impedance: 470k Ohms) Signal Output: 1/4″Monaural Jack (impedance: 100 Ohms) Supply: 9V adapter (center minus plug) Working Current: 128mA Item Size: 3.5 * 9 * 3cm / 1.4 * 3.5 * 1.2in Item Weight: 150g / 5.3oz Note: adapter is not included. Please use adapter whose polarity is positive pole outside and negative pole inside. Otherwise, product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual(English & Chinese) Precise polyphonic octave effects with no distorted sound. With 11 different octave modes. Control knobs for adjusting level of , SUB part and UPPER part signals. True bypass footswitch for switching effects and bypass. for indicating effects or bypass status.