Why do football coaches wear headphones?

Answer 1

To be able to communicate with coaches in the press box and in other areas of the sidelines and also, for the head coach, to call in a play to the quarterback.

Does the quarterback helmet have an earphone?

Answer 2

The Quarterback has speakers in his helmet to get the offensive play in from the coach. And as of this past season one defensive player also has a speaker in his helmet to get defensive calls in. It is typically the MLB(Middle Linebacker) that has it.

Answer 3

To receive feedback on certain defenses and offensive plays on the field by coaches above the field of play.

Answer 4

For quite a few years now, Motorola has had an exclusive contract with the NFL to provide sideline communication gear.