Viriber Outdoor Emergency Survival Whistles for Camping Hiking Sports Dog Training Survivalwhistles -Aluminum Alloy Material, easy to locate , a great emergency Survival Kits. Newdesign - The whistle has no built-in pea ,so it will not mold and breed bacteria because of the pea.You can use it in any dust or dirty water environment. Two sound chamber - Up to 120 decibel, great noise maker, easy to be heard over 1 mile. Small & Light - 0.42ounce,Perfect size match for keychain or backpack, Fashionable, practical and portable. Versatility - Apply tocamping,hiking,hunting,fishing,boating any kind of out door activities.