This is a legendary synth bass processor from AKAI. Purchased in 2003. Over 20 years have passed since I bought it, but I've only taken it out for live performances and rehearsals about 10 times. I mainly used it at home, so there are no noticeable stains or major scratches. I've checked the operation, and there is no crackling in any of the knobs or jacks, and the footswitch works correctly. The LED indicators also display clearly. While there are several other synth bass processors from other manufacturers, this one stands out for its fast response and thick sound. Includes the main unit, box, instruction manual, and dedicated adapter. Thank you for looking.