Features: High-quality distortion guitar effect pedal with true bypass. 2 switches: Vintage/Modern Switch & Boost Switch; --Vintage/Modern Switch: for setting the overall voicing of the pedal's frequencies, to be either darker with a classic tonality or brighter and more modern. --Boost Switch:  for altering the internal gain structure of the pedal to bring much more drive, heavier and more aggressive distortion. 4 control knobs: Tone, Contour, Volume and Gain; --Tone: for adjusting the frequency emphasis on the highs. It interacts substantially with the Contour knob and Vint./Modern switch. --Contour: for adjusting the frequency emphasis overall. It interacts substantially with the Tone knob, and is affected by the Vint./Modern switch as well. --Volume: for adjusting the output level. There's plenty of volume on tap in either standard or Boost mode. --Gain: This control, in conjunction with the Boost switch, lets you dial in anything from a classic, almost laid back early rock tone all the way to modern high-gain. With LED light for indicating effects or bypass status. Compact size with full metal shell, portable and durable. Specifications: Material: Metal Signal Input: 1/4″Monaural Jack Signal Output: 1/4″Monaural Jack Power Supply: DC 9V adapter (negative polarity inside) Item Size: 11.5 * 6.5 * 3.8cm / 4.5 * 2.6 * 1.5in Item Weight: 320g / 11.3oz Note: Power Adapter is not included. Please use the power adapter whose polarity is positive pole outside and negative pole inside. Otherwise, the product may not work properly. Package List: