BOTH of my Stryker helmets are dead.  Won't turn on.  Hooked up to charger and NO lights appear on helmets.  Usually red when needing charge and blue when charge complete.  Now NOTHING.   $800 worth of non-functioning helmets.  Twice I have called company tech support (obviously done overseas).  An email was supposed to have been sent.  Never received.  Called again.  Text guy said he resent.....still nothing.  I am DONE with SENA.