Uh, not sure on this... from the FCS Fans Nation group:

For those of you who may have heard about a new college football rule where one player per team can have a receiver in their helmet that can get communications from the coaches, note that it is only in FBS (and, if I read this right, cannot be used by them in FBS-vs-FCS games), although FCS conferences are allowed to ask the NCAA for permission to use them.