For the signal debugging machine used in the laboratory, the whole panel is black (black can give people a sense of calm and stability) and the panel is made of plastic ABS. The upper end of the panel is a whole piece of black bright acrylic plate, and other places are black frosted. This can effectively form visual contrast and make the product look more hierarchical. The main chassis part is sheet metal, and the side has four silicone foot pads so that the product can be placed flat or vertically.