This is the compressor I recently purchased from HJPF. I've owned the original C4 before, but this Keely compressor provides a natural compression feel! It's in excellent condition, as I've only used it a few times for home recording. (Warranty included) It can be used for both guitar and bass. There's no doubt that this compressor offers a high balance of price and quality. I'm selling it to someone who will take good care of it, as I'm going on a journey to find a new compressor. Silver guitar effect pedal with adjustable Attack, Clipping, and Level. - Model Name: KCP4 - Knob Type: Clear knobs - Functions: Attack, Clipping, Level - Color: Silver - Country of Manufacture: Japan - Connection Terminals: 1/4 inch jack Thank you for looking.