A very clean looking 1980s Made in Japan Yamaha CO-01 Compressor pedal. It is in great condition with only very minor wear and sounds great! It runs on battery and also has a socket for specific Yamaha adapters or docking stations. The foam is missing from the battery compartment. It has a great tone and a switch for 2 levels of attack and is comparable in quality to Boss and similar. These are very well built pedals and have a nice distinctive click to the foot switch that everybody likes!