squawker

Noun

 * 1) Something that squawks.
 * 2) A person who complains or protests noisily.
 * 3)  An informant; a stool pigeon.
 * 4) A loudspeaker used for frequencies intermediate between those of a woofer and a tweeter.
 * 5)  The radio used in police vehicles to keep in contact with headquarters.
 * 1)  The radio used in police vehicles to keep in contact with headquarters.