Multi-function guitar effects pedal, volume and attack adjustment - Model Name: KOMPRESSOR - Control Knobs: Volume, Attack, Sustain - Input/Output Terminals: IN, OUT - Power: Battery or AC adapter - Color: Gray High-quality compressor. I had it on my board, but I've changed my setup and haven't used it in a while, so I'm selling it. It's used, so it's not new. I haven't checked it particularly. It was stored in its box, so I will ship it as is. Thank you.