Audio sensor

An audio sensor was a component of Transformer anatomy that allowed them to hear sounds in their environment.

Generation 1 cartoon continuity
As part of a demonstration of the Dinobots, Blaster transformed into his alternate form allowing Grimlock to practice his fine tuned laser breath to start up Blaster's music. Ironhide told Blaster to stop the music as it was so loud that it was fusing his audio sensors.