A buzzer or beeper is an audio signalling device, Contain piezoelectric (piezo) buzzer / transducer, magnetic buzzer / transducer and mechanical buzzer, piezo or magnetic buzzer / transducer also contain SMD type, we call them SMD piezo buzzer / transducer and SMD electro-magnetic buzzer / transducer. Typical applications are the prompt sound or alarm of household appliances, professional alarm equipment, and confirmation of user input such as a mouse click or keystroke.
