Membrane switch is a set of key functions, indicating components, instrument panel as one of an operating system. By the panel, the circuit, isolation layer, the next four parts of the circuit. In order to touch the normally open switch, under normal circumstances, the upper and lower contact of the membrane switch was disconnected. Press the membrane switch, the upper circuit contacts down deformation, and the lower circuit of the electrode contact with the fingers, the fingers loose, the circuit contacts rebound back, the circuit is broken, the loop trigger a signal. Membrane switch structure is rigorous, beautiful appearance, good sealing. With anti-moisture, long life and other characteristics. Widely used in electronic communications, electronic measurement equipment, industrial control, medical equipment, automotive industry, smart toys, household appliances and other fields.