HyperWhistle The Original Worlds Loudest Whistle up to 142db Loud, Very Long Range, for Referee, Coaches, Instructors, Sports, Teachers, Life Guard, Self Defense, Survival, Emergency uses (Black)Worlds's Loudest Whistle SPL up to 142dB 8x louder than a common whistle 2 mile usable range all-weather construction Unique radial tri-frequency design ..

HyperWhistle (Safety OrangeWorlds's Loudest Whistle SPL up to 142dB 8x louder than a common whistle 2 mile usable range all-weather construction Unique radial tri-frequency design Naturally Buoyant Works in all weather environments, including underwater Patented Design US8925478Features of HyperWhistle (Safety Orange SUPER LOUD - Up to 142dB fo..