An electrical mechanism that produces an intermittent current and an audible buzzing sound, or series of sounds, when a call or signals are received.
The buzzer or hooter was a siren that sounded when the shifts were changing or when there was an accident.
Tachometer rpm limit warning device used briefly in 1963; or, the similar speedometer warning device optional in 1967-1969.
An electric signaling device that produces a buzzing sound.
A buzzer or beeper is a signalling device, usually electronic, typically used in automobiles, household appliances such as a microwave oven, or game shows.