Features: Features heavy rock distortion effect, with neutral-point voltage(BIAS), volume and gain control knobs. With independent knob adjustment of low frequency(LOW), intermediate frequency(MID), and high-frequency(HIGH). Born for heavy music, high gain is its biggest feature. By configuring the BIAS knob, you can adjust your tone between American and British distortion. The distortion and volume of UZI are designed as two dynamically balanced adjustment parameters. With the vol knob unchanged, adjusting the GAIN knob will automatically adjust the signal in the circuit to ensure that the final output volume will not change. 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: 200 Running Current: 13mA Item Size: 108 * 69 * 32mm / 4.25 * 2.72 * 1.26in Item Weight: 261g / 9.23oz Package Weight: 305g / 10.77oz 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.