What is the Q Collar, the device NFL players are wearing around their necks

If you’ve been watching any NFL games recently, you might have noticed some players sporting white (or in some cases, black) horseshoe-shaped collars around their necks. But what are they?
If you’ve been watching any NFL games recently, you might have noticed some players sporting white (or in some cases, black) horseshoe-shaped collars around their necks. But what are they?

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