buzzer

Noun
  1. A push button at an outer door that gives a ringing or buzzing signal when pushed (synset 103227219)
    is a type of: button, push, push button - an electrical switch operated by pressing
    subtypes: night bell - a doorbell to be used at night
    same as: bell, doorbell
  2. A signaling device that makes a buzzing sound (synset 102933464)
    is a type of: signaling device - a device used to send signals

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