buzzer

noun buzzer

• alarm — Alarm is a feeling of fear or anxiety that something unpleasant or dangerous might happen.
• gong — a large bronze disk, of Asian origin, having an upturned rim, that produces a vibrant, hollow tone when struck, usually with a stick or hammer that has a padded head.
• warning — the act or utterance of one who warns or the existence, appearance, sound, etc., of a thing that warns.
• signal — anything that serves to indicate, warn, direct, command, or the like, as a light, a gesture, an act, etc.: a traffic signal; a signal to leave.
• bell — A bell is a device that makes a ringing sound and is used to give a signal or to attract people's attention.