This is the BOSS OD-3. It inherits the legacy of the legendary OD-1 and features a newly developed dual-stage overdrive circuit that focuses on distortion. You can get a sustained sound with a lot of sustain and thick low end, even with a small amount of distortion. Personally, I think it's the easiest to use of the current BOSS distortion pedals. It makes the sound thicker and easier to understand. Velcro is attached to the back. Comes with the original box. I'm selling it because I've switched to a multi-effects unit.