squawker

/S K W AO1 K ER0/
noun
  1. 1

    A person who complains or protests noisily.

  2. 2

    Something that squawks.

  3. 3

    (slang) An informant; a stool pigeon.

  4. 4

    (slang) The radio used in police vehicles to keep in contact with headquarters.

  5. 5

    A loudspeaker used for frequencies intermediate between those of a woofer and a tweeter.