Thank you for viewing. This is an MXR effects pedal featuring the MC401 boost function (left) and overdrive channel (right). The box and instruction manual are included. The boost channel is versatile with no particular character. The overdrive channel produces a fuzz-like distortion when the gain is increased. For more details, please refer to the following YouTube video, although it's from another channel: https://youtu.be/B9PXaS3oRiQ?si=zsSuQ7pCKfNeHLIH - Brand: MXR - Model Name: MC402 Boost/Overdrive - Functions: Boost/Overdrive - Number of Knobs: 4 - Number of Switches: 2 Operation has been confirmed. Thank you for your consideration.