About the emergency whistle: This emergency whistle is made of high quality aluminum for durability and safety. Using high-frequency two-chamber resonance, the volume can reach 120 decibels, and the sound is easy to spread widely. Advantages of emergency whistle: This emergency whistle has excellent airflow design, and the surface is formed by anodized color, which does not fade and has a longer service life. It has no moving parts, no sound absorbing parts, is waterproof and can be used all day, rainy, wet weather. Multifunctional - This emergency whistle can be used for camping, hiking, hunting, fishing, boating, biking and various outdoor activities. In addition, it can also be used as a referee whistle, a dog whistle, a safety guard warning whistle and a safety whistle for people who run out alone, especially for girls who run out alone. Practical and Stylish: Each emergency whistle has a keychain that can be easily attached to a backpack or belt, or can be worn around the neck with a cord, allowing you to whistle quickly. The appearance is simple and elegant, comfortable and practical, and the safety factor is high. Wearing a gold whistle and a silver whistle is also worth it!