The Fox 40® Classic® is the original pealess whistle, designed for referees, coaches, rescue professionals, and general safety use worldwide. Its three-chamber design produces a flawless, consistent, and reliable 115 dB sound that can be heard up to a mile away, cutting through ambient noise, loud crowds, engines, waves, and gale-force winds. The whistle has no moving parts to freeze, jam, or deteriorate, and its chambers are designed to self-clear when submerged in water. The harder you blow, the louder the sound.