The Fox 40 Classic Safety Whistle is the standard choice of referees, coaches at all levels, rescue professionals and general safety personnel worldwide. This whistle features no moving parts to freeze, jam or deteriorate, making it flawless, consistent and reliable. The harder you blow, the louder the sound. This whistle can never be overblown. The chambers are designed to self-clear when submerged in water. This whistle will be heard over ambient noise, loud crowds, the roar of engines, breaking waves and thundering gale-force winds and the sound will be heard up to a mile away. KEY FEATURES: Includes one Fox 40 Classic Safety Whistle Color neon green 115 dB 3-chamber pealess No moving parts to freeze, jam or deteriorate Flawless, consistent and reliable The harder you blow, the louder the sound Easy to blow and cannot be overblown Will be heard above ambient noise, loud crowds, the roar of engines, breaking waves and thunder gale-force winds Chambers are designed to self-clear when submerged in water Sound will be heard up to a mile away Comes with a keyring and split ring