Feature:1. Wide Applications: Emergency whistle is applicable to emergencies in camping, hiking, fishing, boating and other outdoor activities, as well as dog training, school sports, lifeguards, etc.2. Be Heard and Rescued: Double tube survival whistle requires your lightest blow to work and produce loud attention grabbing sound.3. Aluminum Alloy Material: The outdoor camping whistle is made of aluminum alloy, which is anti wear, anti fall and durable.4. Loud Voice: The double tube high frequency whistle has loude voce, and can be heard even in the distance.5. With A Key Chain: The emergency survival whistle with keychain is easy to carry and store with a key chain.Specification:Item Type: Emergency Survival Whistle with KeychainProduct Material: Aluminum AlloyProduct Length: Approx. 5.7cm / 2.2inWeight: Approx. 108g / 3.8oz.Package List:10 x Whistle