Buzzer is an electronic sounder with integration structure. Using DC power, it is widely used on computers, printers, photocopiers, alarm, electronic equipment, telephone, timer and other electronic products.Features:1.Piezoelectric buzzer is mainly made up by ,piezoelectric buzzer chip, impedance matching unit, resonator and shell.2. is composed of transistors or integrated circuits.When switched on, vibrates and outputs audio signal.3.Impedance drives piezoelectric buzzer sound.4.Connected to rated power and the buzzer will sound continuously.5.Can be controlled conveniently.