buzzer
noun /ˈbʌzə(r)/
  /ˈbʌzər/
Idioms - an electrical device that produces a buzzing sound as a signal
- Put your fingers on the buzzer and be ready to answer.
 - The buzzer went off at eight o’clock.
 
Oxford Collocations Dictionaryverb + buzzer- press
 - punch
 - ring
 - …
 
- go
 - go off
 - sound
 - …
 
 
Idioms 
at the buzzer 
- (North American English) at the end of a game or period of play
- He missed a three-point attempt at the buzzer.