Membrane switches are thin and flexible electronic switches that have a similar function to electric switches. They are typically low-voltage and are continually replacing the older push-button types of switches. A membrane switch works by permitting the momentary opening and closing of a circuit. Activation of the circuit is accomplished by touching the preferred keypad button on the device that uses membrane switches. This causes the switch contacts to connect and permit continuity and current flow. The connection or circuit is broken as soon as the finger is released, making it a momentary switch.