The famous durable, pealess Fox 40 whistle is the choice for pools and waterfronts. Its intense 115 decibel high-pitched trill can be heard over long distances. Water does not affect the Fox 40's performance. Innovative thermoplastic material provides superior grip and protection for your teeth. The Classic CMG is ideal for sports officials who need to hold the whistle in their mouth for extended periods of time. 3-chamber pealess design.