The Fox 40 is perhaps the most advanced whistle in the world. The unique patented design has no moving parts and can easily generate an ear piercing 115 decibels! One quick blow clears the sound chamber of water or loose dirt for powerful, clear sound. Used worldwide by lifeguards, military, sear and rescue, law enforcement, tree climbers, grounds workers, etc. Save your vocal cords the stress of getting someone's attention, with a fox.