Maxon CP9Pro+ High-Performance Compressor/Limiter for Smooth Sound Thank you for viewing. I purchased this used about two years ago, so it has some scratches, such as paint peeling, from the beginning. Operation has been confirmed. I used this continuously in live performances, but I am selling it to organize my equipment. This comes with the original box (expired warranty). Please refrain from purchasing if you are nervous about used items. Also, please understand that we do not accept returns.