Membrane switches are electrical switch, which is used for turning on and off a circuit. A membrane switch is a circuit printed on a PET or ITO. The ink used for silk screening printing is usually copper, silver, graphite filled and therefore conductive. It differs from a mechanical switch, which is usually made of copper and plastic parts. It is used for microwave oven panel, air conditioner control panel and TV remote control. Membrane switches use a flexible metal diaphragm mounted in close proximity to a conductive base electrode at the switch bottom.