Authentic. Original. This is the one that changed the game!

For referees and coaches at every level who want every call to be heard and depend on its reliability. Flawless, consistent and penetrating sound keeps the referee in control of the game. be heard above the crowds and players. standard choice for personal safety and rescue professionals worldwide. it will be heard above ambient noise, engine roars and breaking waves. Chambers are designed to self-clear when submerged in water. no moving parts to freeze, jam or deteriorate.