The Fox 40 Classic Whistleis the standard choice referees and coaches at all levels, rescue professionals and general safety worldwide. Great for all sports andanyone that needs a whistle, teachers, coaches, referees. It's easy to blow and cannot be overblown. The harder you blow, the louder the sound. The ClassicFox 40 Whistlewill be heard above loud noises.

• No moving parts to freeze, jam or deteriorate
• Flawless, consistent and reliable
• Chambers are designed to self-clear when submerged in water
• Sound will be heard up to a mile away