BBE Acoustimax pre-amp and sonic maximizer pedal. Great preamp and DI and mute switch with a handy eq notch, all in one for acoustic pickups. I went through 3 or 4 of these over the years touring, they're sturdy as and this one only went out on the road for a year or two I think...is in pretty good nick and sounds great. Will be a really big boost for any acoustic sound and adds heaps of control. Think it's missing the top row of knobs from the looks of it. Also weirdly this runs off 12V AC (most pedals are DC). Most pedal power boxes have one 12V AC outlet, or see my other listings. I don't have the original power supply. Velcro on back as per photos.