The MXR Wylde Overdrive is an overdrive pedal with three control knobs: Tone, Output, and Gain. It allows for a wide variety of tones. Operation has been confirmed. There are no major scratches, but there is some wear and tear. Please take a look at the photos and consider purchasing only if you are comfortable with the condition. - Model: Wylde Overdrive - Brand: MXR - Control Knobs: OUTPUT, TONE, GAIN - Input/Output Terminals: INPUT, OUTPUT, DC jack Thank you for viewing.