1: The PCBA and base of the same type of switch are the same; 2: There are two kinds of frames: plastic frame without edging; aluminum frame; 3: There are 3 types of glass: right-angle glass; 2.5D edge flat glass; 2.5D edge pit glass; 4: Glass color: black; white 5: Single-fire wire description: a single-fire zero-fire universal switch needs to be equipped with a single-fire wiring method； 6: 1 gangsupports big buttons;