●Long lasting, light weight, very small and easy to carry. ●The emergency whistle material is high quality, durable and reliable. ●The lifeguard whistle is very suitable for any outdoor use, waterproof, suitable for any weather conditions ●Ultra-loud waterproof emergency whistle, which can be played without effort and produces high-frequency and crisp sound heard from a long distance ●Thank you for your visit and please feel free to contact us if you have any questions.