Features: 3 functional knobs(volume/tone/gain) for adjusting the performance of the overdrive effect. Dynamic and delicate overdrive effect pedal show details to the fullest. Wide range of gain adjustment, easy to adjust by turning the GAIN knob. From BOOST type voiceless to distorted states, it can be displayed in very clear and rich states. Aluminum alloy metal shell, durable and sturdy, lightweight and compact. Mini compact size, portable and easy to operate. Equipped with a non slip silicone pad, easy to install, making the effect pedal non shifting and anti slip during performance. Specifications: Material: Aluminum alloy Input Impedance: 1M Output Impedance: 550 Running Current: 17mA Item Size: 108 * 69 * 32mm / 4.25 * 2.72 * 1.26in Item Weight: 248g / 8.74oz Package Weight: 294g / 10.39oz Package Size: 12.5 * 8 * 5.7cm / 4.92 * 3.15 * 2.24in Package List: 1 * Effect Pedal 1 * Silicone Pad 1 * Manual (English) Note: Please use a DC +9V power supply which is positive outside and negative to connect this unit and connect the input and output socket to this unit.