A membrane switch is an all-in-one operating system integrating key functions, indicator elements, and instrument panels. It consists of four parts: the panel, the upper circuit, the isolation layer, and the lower circuit. When the membrane switch is pressed, the contacts in the upper circuit deform downward to contact and conduct with the lower circuit's plates. Upon releasing the finger, the upper circuit contacts spring back, breaking the circuit and triggering a signal. The membrane switch has a strict structure, an aesthetically pleasing appearance, and good sealing properties. It features a long service life and is widely used in industries such as electronic communications, electronic measurement instruments, industrial control, automotive industry, smart toys, and home appliances.