Samless stell Whistle is used in Life-saving in Emergency and in sports referee ,The max voice 150 db.
Whistle has double tube and crisp sound, without pea ,not moldy, you can use it in any environment.
Whistle made of Food Grade Stainless steel, Safty confirmed.
In emergency or sports referee, the double tube design can get the same db ,you can save 30% energy than normal whistle.
With hang buckles and chain belt, not easily lost.