Hard membrane switch means that the pattern and circuit of the switch are made on a common printed circuit copper clad board. The hard membrane switch is characterized by its simplicity, process stability, low resistance, and the ability to directly solder certain components of the circuit on its backside. In the case of a small area, the hard liner layer can be omitted. Hard membrane switches generally use metal guides as conductive labyrinth contacts, and therefore have a better handle. The unfavorable aspect is that it is not convenient to install the flexible membrane switch in the whole machine. It is often necessary to weld the plug and lead the lead through the flat cable. Information Feedback of Hard Membrane Switch In addition to beep signals and LED indications, metal touch springs are commonly used.