The MXR bass compressor is a high-performance compressor designed to improve the sound quality of your bass. It has some signs of use, but it's in good condition. It works perfectly. Please refer to the photos. This multi-functional MXR bass compressor features various controls for adjusting your sound. - Model Name: bass compressor - Brand: MXR - Function: Compressor - Controls: Release, Ratio, Attack, Output, Input - Accessories: Box, Instruction Manual Thank you for looking.