Features: Delivers that warm, natural tube overdrive sound. By rotating the knobs you can boost the guitar amp for colorful tone or overdrive itself for unique pedal sound. True bypass hardware switching. LED indicator shows the status of effect. Powered by AC adapter. Mini and portable, enclosure is aluminum alloy shell. Rubber pads on the backside is anti-skid, which enhances the stability and avoids friction between the effect pedal and the ground. Specifications: Brand: KOKKO Model: FOD3 Main Material: Aluminum alloy Input Impedance: 1M Ohms Output Impedance: 10K Ohms Power Supply: External AC adapter delivering 9V DC regulated minimum 300mA Item Size: 9.4 * 5.1 * 5.3cm / 3.7 * 2 * 2.1in Item Weight: 177g / 6.3oz Package Size: 10 * 7.5 * 6.2cm / 3.9 * 3 * 2.4in Package Weight: 214g / 7.5oz Package List: 1 * Guitar Effect Pedal 1 * User Manual(English) Note: Please use the 9V power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly.