About Emergency Whistle: This emergency whistle is made of high-quality aluminum for durability and safety. The whistle has a smooth surface and is more practical and structured than other materials. Double Tubes Design: Double-tube design provides a louder and crisper sound. It can be heard from a far distance without any effort to blow. Excellent airflow design allows being used in all weather environments, nothing to jam. Distress Signal: The whistle has gold, silver and black 3 different colors for you to use. double tubes emergency whistle can provide up to 120 decibels, enough to be heard at long distance Attracting attention in any emergency. If you lose contact with your friends on the mountain and there is no signal on the phone, you can whistle. The whistle can help you find your friends. Small and Hand: 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 Multiple Use: Whether you're fishing, camping, boating or hiking, this emergency survival whistle will be your safety companion in any emergency situation, as well as for referees, lifeguards, training pet dogs, etc. The Size The emergency whistle length is 6.6cm, width is 1cm; key ring diameter is 2.9cm and the materials is aluminum alloy. compact lightweight.