Membrane switch is an operating system with key function, indicator and instrument panel. It consists of panel, upper circuit, isolation layer and lower circuit. When the membrane switch is pressed, the contact of the upper circuit deforms downward and contacts with the plate of the lower circuit. After the finger is released, the contact of the upper circuit rebounds back, the circuit is disconnected, and the circuit triggers a signal. The membrane switch has rigorous structure, beautiful appearance and good sealing performance. It has the characteristics of moistureproof and long service life. Widely used in electronic communication, electronic measurement instruments, industrial control, medical equipment, automotive industry, intelligent toys, household appliances and other fields.