About Emergency Whistle - This emergency whistle is made of high-quality aluminum, which is durable and safe. It adopts high-frequency double-cavity resonance, the volume can reach 120db, and the sound can be easily transmitted far away.Emergency Whistle Design Advantages: This emergency whistle has an excellent airflow design, and the surface is anodized to form a color that will not fade and has a longer service life. And it has no moving parts, no soundproof parts, waterproof, and can be used all day, rainy days, wet weather.Wide Use - This emergency whistle can be used for camping, hiking, hunting, fishing, boating, cycling and any type of outdoor activities. In addition, it can also be used as a referee whistle, dog whistle, security personnel warning whistle and safety whistle for a person to use when going out alone, especially when a girl goes out alone.Comfortable and stylish Each whistle is equipped with a keychain, which can be easily hung on a backpack or belt, or hung around the neck with a rope, allowing you to whistle quickly. The appearance is simple and elegant, comfortable and practical, and the safety factor is high. It is also a great value to carry gold and silver whistles with you!Tip: We are very confident in our products. If you encounter any questions or suggestions during the purchase process, you can contact us directly by email, and we will solve the problem for you at the first time.