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.
• 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.
• Design: 3-chamber pealess