Designed by search and rescue professionals, the Scotty 780 Lifesaver Whistle will keep you safe and heard. Built with ABS plastic, it will not stick to your mouth like metal whistles, so use it in the heat or freezing cold. The double chamber design allows for multiple pitches, so be confident your sounds will travel and be heard. The large tooth grip allows for you to use it hands free and the lip seal prevents loss of air in extreme cold. It meets anti-choking standards for children. Next time you're out on the water, whether a kayak or a pool, make sure you stay heard and alert with a Scotty 780 Lifesaver Whistle.