About the emergency whistle: this emergency whistle is made of high quality aluminum to ensure durability and safety. It uses high-frequency two-chamber resonance and the volume can reach 120 dB, and the sound can easily spread wide. Advantages of emergency whistle: this emergency whistle has 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-absorbing 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 all kinds of outdoor activities. In addition, it can also be used as a referee whistle, dog whistle, safety officer warning whistle and safety whistle for a person who runs out alone, especially for girls who run out on their own. PRACTICAL AND STYLISH: Each emergency whistle has a keychain that can be easily attached to a backpack or belt, or can be worn around your neck with a rope for you to whistle quickly. The appearance is simple and generous, comfortable and practical and has a high safety factor. Wearing a golden whistle and a silver whistle is also a nice value