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Speaker and Buzzer

speakers-buzz.jpgloudspeaker (or "speaker", or in the early days of radio "loud-speaker") is an electroacoustic transducer that produces sound in response to an electrical audio signal input. In other words, speakers convert electrical signals into audible signals.

buzzer or beeper is an audio signalling device which may be mechanicalelectromechanical, or piezoelectric. Typical uses of buzzers and beepers include alarm devicestimers and confirmation of user input such as a mouse click or keystroke.