For JOYO R-20 King of Kings is a dual channel crunch pedal with independent clipping diodes,turn on the switch "2", what you get is an overdrive pedal. In order to make the pedal work properly and quietly, we do recommend JOYO 9V DC pedal power supply with noise reduction technology. Dual channels, each channel features independent knobs Volume, Gain, Tone and two clipping diodes switches, you are easily to achieve a lot of tones in both single channel. Input Impedance:1/4Inch mono audio jack (1M KΩ) Output Impedance:1/4Inch mono audio jack (1KΩ) Running Current:20mA Pedal Powered:by 9V DC power adapter Dimensions:130x110x50mm Colour:Gold Material:Metal Package Contents: 1 * For JOYO R-20 King of Kings Overdrive Pedal 1 * English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.