Feature: 1. Aluminum alloy material, the surface is colored by anodizing technology, which is not easy to fade, and the service life is longer and lighter. 2. Equipped with a keychain buckle, which is convenient to carry and can be fixed to a lanyard or key. 3. Dual‑tube survival whistle, with larger caliber and louder sound, can provide up to 120 decibels of sound, enough to be heard at a long distance. 4. Waterproof camping whistle, with excellent airflow design, can be used in all‑weather, rainy and humid weather. 5. Good tool for camping, hiking, hunting, mountaineering, boating and other outdoor activities, also fit for referees, coaches, lifeguards, dog training, etc. Specification: Item Type: Double Tubes Whistle Material: Aluminum Alloy Surface Treatment: Oxidation + Sandblasting Color: Silver Whistle Length: Approx. 55mm/2.2in Whistle Width: Approx. 15mm/0.6in Whistle Thickness: Approx. 8mm/0.3in Weight: Approx. 13.0g/0.5oz Maximum Volume: About 120dB Package List: 1 x Double Tubes Whistle Note: Survival whistle is for emergency survival in hiking and camping, not toys under 6 years old.