This is a Modular Control panel designed with flexibility in mind.... easily rearranged to suit projects "on the fly". This version includes a mounting Bezel for an 8x8 LED matrix, which can be used to displaying characters,numbers, graphics or even animations. The control knobs fit standard 6mm Potentiometer shafts. You may also notice a few holes here and there for 0.2" Leds. There is an angled base unit that allows you to prop up the panel for standalone desktop use. The Puzzle parts are designed with Zero tolerance to give tight fit so be prepared to sand or X_Acto the edges a tad.