This is the early version of the Behringer Overdrive Distortion pedal that became the OD300 that is still available today. This pedal is pretty much a BOSS OD-2 ripoff. It's in great shape and works perfectly!
Info from the manufacturer:
Some tunes call for an edgy modern-crunch; others call for the classic sound of hot and bothered tubes. Some need a little of both. The BEHRINGER OVERDRIVE/DISTORTION OD100 has all your bases covered.
Truckloads of Tone
With its dedicated Overdrive/Distortion blend dial, you can turn all the way to the left for pure overdrive, or all the way to the right for straight-ahead distortion. In between, you get an infinite amount of options for creating the perfect overdrive/distortion cocktail. And with the dedicated Tone, Level and Drive dials, everything you need to create a signature sound is at your fingertips.
Ease of Use
The LED tells you when this pedal is working its magic, and the top-quality on/off switch maintains excellent signal integrity in bypass mode. You can power the OD100 with either a 9 V battery, or the optional PSU-SB DC power supply (not included).