This is a MI Effects CRUNCH BOX. It seems to be modified by SoulPowerInstruments. I bought it used and really liked it, but I haven't been using it much lately, so I'm putting it up for sale so someone else can use it. Compared to the unmodified version, it's much easier to use thanks to the added switch on the top left. I don't have an adapter, so I've only tested it with batteries, but there's no scratchiness and it works fine, although the output jack is a little stiff. I'm not accepting returns because I'm worried about swaps, so please understand.