Fox 40 Classic Official Coach & Referee Whistles W/ Finger Grip Black Features: The Fox 40 Classic Fingergrip is for referees and coaches at all levels who want every call to be heard Fingergrip model has adjustable fingergrip that fits securely and comfortably over group of fingers 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 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 Sound will be heard up to a mile away Design: 3-chamber pealess Sound Power: 115 dB