About emergency whistle: This emergency whistle is made of high-quality aluminum for durability and safety. It uses high-frequency dual-chamber resonance and the volume can reach 120 db, and the sound can easily spread far away. .Emergency whistle design advantage: This emergency whistle has an excellent airflow design, the surface is anodized for color formation, does not fade, and has a longer service life. And it has no moving parts, no sound blocking parts, waterproof, can be used all day weather, rainy days, wet weather. .Versatile: This emergency whistle can be used for camping, hiking, hunting, fishing, boating, cycling and any type of outdoor activity. In addition, it can also be used as a referee whistle, a dog whistle, a security officer's warning whistle and a security whistle for a person to go out alone, especially for girls to go out alone. .Convenient and stylish: Each whistle has a key chain that can be easily attached to a backpack or belt, or it can be worn around the neck with a rope, which allows you to whistle quickly. The appearance is simple and generous, convenient and practical, and has a high safety factor. Wearing a golden whistle and a silver whistle is also a beautiful value .Tip: We are very confident in our products. If you have any problems or suggestions during the purchase process, you can contact us directly by email, we will solve the problem for you in the first time. .