The Fox 40® Classic™ Fingergrip is for referees and coaches at all levels who want every call to be heard.
Fingergrip model features:

• Adjustable fingergrip that fits securely and comfortably over group of fingers
• No moving parts to freeze, jam or deteriorate
• Flawless, consistent and reliable performance
• The harder you blow, the louder the sound
• Easy to blow and cannot be overblown
• Chambers are designed to self-clear when submerged in water
• Will be heard above ambient noise, loud crowds, the roar of engines, breaking waves and thundering gale-force winds