Possibly the biggest selling whistle of all time, easy to blow, small, high pitch 117dBA and loud. Favoured by customers in colder settings where metal might stick to the skin; also chosen by officials in sports, teaching, animal training, police authorities, military units and music specialists. Recommended for anyone who is short of breath, as a safety whistle for the young and elderly. what is more this whistle has refereed F.A. & World Cup Finals Its power and reliability is proven with sales of over 30 million.