This is a set of the RJM mini amp gizmo and a dedicated cable for Mesa Boogie head amplifiers. ① RJM mini amp gizmo The drawback of Mesa Boogie head amplifiers was the lack of MIDI control. With this product, complete mini control becomes possible. With a single switch, you can switch the amplifier's channels and simultaneously switch MIDI-controllable effects, allowing you to use the Rectifier like a multi-effects unit, with clean, backing, solo boosts, and effects, eliminating the drawbacks. ② amp gizmo RG-16 (product ①) is a dedicated cable for connecting to the amplifier. By connecting with this cable, complete MIDI control becomes possible. I rarely had a chance to use it after purchase, so it's almost in unused condition. There are no scratches. All accessories are included: instruction manual, warranty (expired), and cable instruction manual. This dedicated cable is compatible with Mesa Boogie amplifiers such as Rectifier, Road King, Roadster, and Nomad. This is a very valuable item, so how about it if you were looking for one?