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An electromagnetic buzzer is a "chattering relay" where current to the relay coil is interrupted each time the relay coil begins to pull in the armature, causing it to release the armature and reconnect current through the relay coil. This cycle repeats rapidly causing a buzzing sound.

There are also electronic buzzers where a very low frequency oscillator drives a small speaker (usually a piezoelectric disk) causing a buzzing sound. One brand of these is Sonalert.

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