For referees who want every call to be heard and depend on its reliability. Flawless, consistent and penetrating sound keeps you in control of the game. Be heard above the crowds and players. Chambers are designed to self-clear when submerged in water. No moving parts to freeze, jam or deteriorate.
Penetrating sound cuts through crowd noise and carries over a long distance. Tested. Proven. Faultless performance every time. These are the whistles of choice for professional and amateur sport federations worldwide!