Features: Metal distortion pedal has special and strong distortion effect, entirely gaining and boosting the distortion degree of metal. 3 working modes: Hi Boost- heavy metal distortion sound with largely increased signal; Boost Off- metal distortion effect; Lo Boost- a small range of high frequencies have been properly increased. VOLUME knob adjusts distortion sound volume; TONE knob controls the brightness of tone; DIST knob adjusts the mixture of distortion degree. True bypass provides transparent tone; with LED indicator showing the working state. Mini size design, aluminum alloy shell, portable and durable. Specifications: Material: aluminum alloy Input:1/4 inch Monaural Jack (Impedance: 1M Ohms) Output:1/4 inch Monaural Jack(Impedance: 470K Ohms) Power Supply:DC 9V(Plug polarity is Positive on the barrel and negative in the center) Working Current: 25mA Item Size: 3.8 * 9.5 * 3.5cm / 1.5 * 3.7 * 1.4in Item Weight: 200g / 7oz Package Size: 12 * 6.5 * 6.5cm / 4.7 * 2.6 * 2.6in Package Weight: 270g/ 9.5oz Note: Please use the power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly. Package List: 1 * Effect Pedal 1 * User Manual(English & Chinese)