Original Classic Fox 40 Whistle The Fox 40 is a pealess whistle designed to NOT STICK (when wet or over blown) and to be heard over long distances. It is ultra shrill, intense, and penetrating. . Fox 40 Classic Whistles are great for dog training because they are designed to be heard above all kinds of noise including breaking waves and thundering gale-force winds. The Fox 40 Classic whistle's chambers are designed to self-clear when submerged in water. The Fox 40 Classic also has no moving parts to freeze or jam! Recommended. Design: 3-chamber pealess Sound Power: 115 decibels Choose Color: Orange or Black