football referee whistles !

how are they so loud ?

even with a crowd of 60k+ all singing you can hear them without much problem, if i got myself the P.E teachers whistle i dought it would be that effective if i blew it from the crowd,

you could still hear them over the thousands of vuvuzella's at the world cup there gota be something to it surley ..

its all down to the type of whistle used, FIFA and alot of other sporting organisations recomend the use of the FOX40 Classic. It is a 3 barrelled pealess whistle. It is the same design of a whistle you will find on life jackets. It was specifically designed for sport by a Canadian called Ron Foxcroft. For more information their website is www.fox40world.com