Hand-wired serial, initial model. Operation confirmed. This model is like a combination of an RC Booster and an AC Booster, and of course, you can swap the order. I got this at the time because I wanted to get the Allen Hinds sound. One owner, non-smoking environment. A 2-channel guitar effects pedal with adjustable volume, gain, and tone. - Model Name: AC+ PLUS - Brand: Xotic Effects - Number of Channels: 2 channels - Control Knobs: Volume, Gain, Tone - Input/Output Terminals: IN, OUT - Switches: CH A, CH B, order can be swapped - Color: White Thank you for viewing. We will re-confirm the operation before shipping, so we cannot respond to any problems during or after shipping. Thank you for your understanding.