ENO EX OCT-1 OCTAVE Mini Octave Guitar Effect Pedal True Bypass Full Metal Shell: UPR. OCTAVE for adjusting the level of the synthesized signal which one octave higher.1 OCT DOWN & 2 OCT DOWN for adjusting the level of the synthesized signal which one or two octave lower.NORMAL knob for adjusting the level of the dry signal.True bypass footswitch for switching effects and bypass.LED light for indicating effects or bypass status.Compact size octave guitar effect pedal with full metal shell, lightweight and durable. Specifications: Power Supply: DC 9V adapter (positive outside and negative inside)(not included) Item Size: 3.5 * 9 * 3.5cm / 1.4 * 3.5 * 1.4in Signal Input: 1/4″Monaural Jack (impedance: 500k Ohms) Item Weight: 145g / 5.1oz Working Current: 30mA Signal Output: 1/4″Monaural Jack (impedance: 100K Ohms) Material: Metal Note: Please use the power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly. The power adapter is not included. Package List: 1 * Pouch 1 * User Manual(English & Chinese) 1 * Effect Pedal