Fox 40 Whistle With Mouth Guard AQ6847M AQ6847M This Classic Fox 40 Whistle has a cushioned mouth grip which has a soft ribbed surface for added comfort. The Classic Fox 40 Whistle is pealess with a high-pitched ultra shrill tone. Made of durable plastic, this 3-chamber whistle is designed to be heard above crowd noise. Used by lifeguards, referees and coaches at every level. 115 decibels of power ensures every call will be heard!Colors: Blue, Red or Yellow.