There are four piezo-switching functions available: pulse, 6-second momentary, 30-second momentary and toggle. The pulse function provides a 120-millisecond pulse when the switch is activated. The 6-second momentary will provide switch closure for as long as the switch is depressed for up to 6 seconds. The 30-second momentary switch option will close the switch circuit for as long as the switch is depressed for up to 30 seconds. The toggle version will switch back and forth between an open and a closed circuit every time the switch is depressed. The functionality of the 30-second momentary and toggle versions is achieved by logic circuitry and, therefore, external power is required.