N.F.L. Defenses Use Speakers in Helmets to Relay Calls - The New York Times
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Speakers in every player's helmet would eliminate need to huddle - NBC Sports
Chiefs speedster Tyreek Hill jokes (we think) he may put together relay team for Olympics - The Boston Globe
A Helmet Shortage Is Hitting High School Football Across the Country - The New York Times
When technology fails: How NFL teams handle helmet speaker outages - ESPN - Green Bay Packers Blog- ESPN
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Browns involved in QB helmet communications controversy - Dawgs By Nature
Do football players have speakers and microphones in their helmets? Le, nfl mic'd up
Around the NFC North: Packers Trash Talk, Lions Get New Helmets, Rodgers Talks Ayahuasca, More - Bleacher Nation
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Building a better helmet - The Globe and Mail
Insider Knowledge: NFL coach-to-player communication
