This is the Seymour Duncan Pickup Booster, the reissue whose Gain knob starts at 0 dB. All the way down it's a clean buffer that keeps long cable runs from going dull, and all the way up it's 25 dB of clean boost.

The Res Peak switch works with the pickups themselves, so it only does anything with the guitar plugged straight into the pedal, which is why the end panel says to put it first in the chain. On 1 a single coil sounds like a vintage humbucker, on 2 like a high-output humbucker, and 0 leaves it alone. It's true bypass and runs on a 9-volt battery, through the door on the bottom, or a 9 to 18 volt adapter, center negative. More voltage gives more headroom, not more gain.

Dark red. Good condition, shown in the photos. Comes with just the pedal, no box.

Includes: The pedal only, no box