Fox 40 Classic Kayak Whistle - Fox 40 pealess whistles are extremely loud, with no moving parts to freeze or jam. The patented design moves the air blast through three-tuned chambers. A blast from this whistle rises above crowd noise, breaking waves and thundering gale-force winds - up to 115 decibels! The chambers are designed to self-clear when submerged in water, ready to sound immediately without distortion. With the loudest, shrillest penetrating power, this is the whistle of choice for professionals and amateurs worldwide.