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PP material high frequency survival safety whistle, whistle has three air chambers, allow the sounds to overlap and produce the incredible volume. Double opening hole, high audio, whistle is of the loudest in the world, with this model, can achieve 4000Hz tones, gives you a huge range that can still heard kilometres away. In the past this safety whistle was attached to every life jacket in order to be prepared for emergency as it is and can therefore used in any situation. Tail equipped with round hole, can pass through less than 4mm rope, prevent whistle loss, comes with a handy clip to attach to clothes, tie, pants and backpack, can even float on the water. Whistle is small, thin and very light, can attached to a bunch of keys without any problems, bright orange colour you cannot lose it easily, colour also stands for emergency.