Definition of "buzzer"

And wants not buzzers to infect his ear / With pestilent speeches of his father's death.

c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene v]

... it left, however, a bee at his ear and an itch to transfer the buzzer's attentions and tease his darling; for she had betrayed herself as right good game.

1895, George Meredith, The Amazing Marriage

I flipped my wallet open on her desk and let her look at the buzzer pinned to the flap.

1939, Raymond Chandler, The Big Sleep, Penguin, published 2011, page 28

Her brother is in secret come from France,Feeds on this wonder, keeps himself in cloudsAnd wants not buzzers to infect his earWith pestilent speeches of his father's death.

c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act IV, scene v]