High-quality rugged bone conductive compact helmet-com unit for professional working in hazardous conditions. It has a dirt protected microphone and a single speaker and easily mounts into most helmet types and provides clear and hands-free communication. PT500 is small & compact tactical Push-To-Talk perfect solution for police & military applications among others. The PT500 has a customizable audio socket for Peltor, Savox, NATO UK & NATO US wired headsets.