MXR clean booster. Body only. Usable for both guitar and bass. I'm listing this as junk because there was some scratchiness only when moving the knobs during the operational check. Since it only occurs when the knobs are moved, I think there shouldn't be any particular problems when using it normally as a booster. Also, there are scratches on the surface due to use. I have prepared a 360-degree photo, so please check the appearance carefully before purchasing. The following is quoted from the web: A booster created in collaboration with Custom Audio Electronics (CAE) The MXR® CAE BOOST/LINE DRIVER is a booster created in collaboration with Custom Audio Electronics (CAE). It can provide a clean boost of up to +20dB. It's an ideal pedal for amplifying guitar or bass signals and sending a bright tone to the amp. It can also be used as a buffer or line driver, and is designed to minimize signal loss.