Brand new, unused item. This model is an effects pedal based on the KEELEY C4 COMPRESSOR. Designed based on the classic Ross-style compressor, this effector provides natural compression while evening out the guitar's sound. It achieves a clear sound by maintaining a high dynamic range and suppressing unwanted noise. It is loved by many guitarists for emphasizing sustain and creating a smooth tone suitable for lead playing and arpeggios. It gives the impression that the knobs and effects are very faithfully created, as it is hand-wired with reference to the original's circuit board. A very compact enclosure is also a major feature, and it will maximize the effect in the minimum space of an effects board that can be assembled like a puzzle. Please try it out first!!