This is an A.Y.A. R-COMP compressor, made in Japan. I purchased it used, but it was mostly unused and has been stored in its box. I tested the sound, and it's in good working order with no crackling. - Model Name: R-COMP - Brand Name: A.Y.A. - Country of Manufacture: Japan - Controls: sustain, level - Serial Number: #3125 - Input Jacks: Standard jack - Output Jacks: Standard jack - Power Connector: DC jack Thank you for looking!