Emergency whistle, it can be used in all-environment all-weather, rainy day, humid weather with excellent airflow design, easy to whistle and make clear and maximum sound. This Ultimate Life-saving whistle, it is made of Stainless steel with louder Sound using in Emergency and in sports referee, double tubes can provide up to 150 decibels that pitch crisp sound can be heard far distance. It is highly durable Made of high quality stainless steel, of food grade, Safety confirmed. It won't do harm to your health. And the high quality material makes it durable, you can use it for a long time. Double Tube design, it is easily blown softly so that just the blast out a loud tone. You can save 30% energy than normal whistle. If you get separated from the group while hiking. The perfect size to attach to keychain or backpack, you could put it on your keychain and take it everywhere you go. It is fashionable, practical and portable. A good partner for camping, hiking, hunting, fishing, boating any kind of outdoor activities.