This is a clone of the MAD PROFESSOR Royal Blue Overdrive made by EfF Audio Prod. It's really well made!! It's good! I'm selling it because I'm switching to a multi-effects unit. Body only, no box. No operational problems! Here's the manufacturer's description: It was made with a band-wired specification that is not available in the original. Also, high-quality parts such as Wima capacitors are used. The copper foil board is wired with solid wiring, so the noise resistance and sound quality are also of good quality. It runs on a 9V center-negative adapter.