BOSS OC-2 Octave. This is a legendary pedal that produces a thick tone that only this model can achieve. If you're looking for one, please consider it. The item includes the pedal itself only. No box, manual, or adapter are included. Functionality has been confirmed. There are some scratches and dirt due to aging, but there are no issues with its use. ACA power type. *When using an adapter, it may not function properly if powered by anything other than an ACA power supply. I will not answer questions about the serial number other than what is shown in the image.