Features: Mini and portable, and hard metal shell is stable and durable. With tone, level and comp knobs, you can adjust the tone of sound, output volume and intensity of compression. The true bypass design can minimize the signal loss to help you create best performance. The LED indicator shows the working state, powered by 9V battery or DC 9V adapter(not included), convenient to use. Standard 6.35mm side output and input jack fits for most guitar and amplifier. Specification: Condition: 100% Brand New and High Quality Material: Aluminum Alloy + Electron Color: as picture shown Jack: 6.35 mm / 0.25 inch Working Current: 12mA Input Impedance: 470k Ohms Output Impedance: 1k Ohms Output Impedance: 470 Ohms Power Supply: External 9V battery or DC 9V adapter Dimensions(L x W x H): Approx. 95 x 45 x 48mm / 3.74 x 1.77 x 1.89inch Weight: Approx. 280g Packing List: 1 x Guitar Effect Pedal 1 x User Manual 1、Mini and portable, and hard metal shell is stable and durable 2、With tone, level and comp knobs, you can adjust the tone of sound, output volume and intensity of compression 3、The true bypass design can minimize the signal loss to help you create best performance 4、The LED indicator shows the working state, powered by 9V battery or DC 9V adapter(not included), convenient to use 5、Standard 6.35mm side output and input jack fits for most guitar and amplifier