Piezo-ceramic buzzer sound elements are made by bonding piezo-ceramic chips on medalling ones, Mounted into resonant cavities and excited by, oscillating circuits. The buzzer elements will give out graceful sounds. The buzzer elements have found wide applications in electronic clocks, telephone sets, electronic toys, musical cards, electronic door-bells, home appliances alarms, testing and controlling systems, and so on. They are featured of small size, light weight, low power-consumption,  pleasant sound, No sparking, high reliability and long 1ife.