The MXR bass compressor is a versatile effects pedal designed to enhance your sound quality. I'm selling it because I'm switching to a multi-effects unit. It has only been used indoors in a smoke-free environment. Operation has been confirmed. - Model Name: bass compressor - Brand: MXR - Controls: GAIN REDUCTION, RELEASE, RATIO, ATTACK, OUTPUT, INPUT - Input/Output Terminals: OUT, IN, DC jack - Bottom: Velcro attached - Color: White Thank you for looking.