The MXR Dyna Comp is a red compressor effects pedal with OUTPUT and SENSITIVITY controls. I took it out of the box, but ended up using a multi-effects unit, so I haven't used this. - Brand: MXR - Model Name: Dyna Comp - Color: Red - Controls: OUTPUT, SENSITIVITY - Input Terminals: Input - Output Terminals: Output Thank you for looking. I have confirmed that it powers on. There are no problems. Price negotiations are possible.