Selling to organize my equipment. Purchased used this October. Made in Japan, ET5212-510B board, op-amp is 4558DD (glossy). Originally, this pedal only supported an ACA adapter, but it has been modified to be powered by a current (PSA) adapter, and the knobs have also been replaced for ease of use. There are scratches from use, but it works fine. No box, just the unit itself. Thank you for looking. Thank you. - Model Name: BOSS SD-1 - Type: Overdrive #BOSS #SD-1