a person or thing that buzzes.
a signaling apparatus similar to an electric bell but without hammer or gong, producing a buzzing sound by the vibration of an armature.

1600–10; buzz1 + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
buzzer (ˈbʌzə)
1.  a person or thing that buzzes
2.  a device that produces a buzzing sound, esp one similar to an electric bell without a hammer or gong
3.  (NZ) a wood planing machine

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, "buzzing insect," agent noun from buzz. Of mechanical devices, from 1870 (steam-powered at first; electric mechanisms so called from 1884).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It was a sight to behold, this copper without a buzzer taking the law in his
  own hands.
If the red visual alert light glows and/or an audible alert buzzer sounds, the
  circuit breaker has opened to protect the aerator.
Both teams will use buzzer systems to signal an intention to answer a question.
The offeror will provide all questions, buzzer systems, materials and supplies
  needed for the event.
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