According to NFL rules, the quarterback and one defensive player on each team can have a radio to the coaches on the sidelines to make communicating and ... So that the referees are aware, helmets with radios are m... ... And lastly, on several plays, a few “big-name” players will have mics taped on their shoulder pads. read more
Quarterbacks do, in fact, have microphones in their helmet. And it isn't just quarterbacks, there is one, or multiple, members of the defense that have the sticker on their helmets, as the one seen in the picture I provided. It is rare to see any other offensive player with the sticker because it is mainly the quarterback that runs the show. read more