Features:Precise polyphonic octave effects with no distorted sound.With 11 different octave modes.Control knobs for adjusting level of original, 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: MetalSignal Input: 1/4″Monaural Jack (impedance: 470k Ohms)Signal Output: 1/4″Monaural Jack (impedance: 100 Ohms)Power Supply: DC 9V adapter (center minus plug)Working Current: 128mAItem Size: 3.5 * 9 * 3cm / 1.4 * 3.5 * 1.2inItem Weight: 150g / 5.3ozNote:The power adapter is not included.Please use the power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly.Package List:1 * Effect Pedal1 * User Manual(English & Chinese)