The whistle is designed to give you the best chance for survival in a disaster or lift-threatening situation. It is easy to blow and very sustained, because it's made of stainless steel. Double tubes can provide up to 150 decibels, can be heard far distance.

Features:Made of stainless steel, using in emergency and in sports referee. Double tubes can provide up to 150 decibels, can be heard far distance. 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.Fashionable, practical and portable.Perfect size to attach to keychain or backpack, take it everywhere you go. A good partner for camping, hiking, hunting, fishing, boating, any kind of out door activities.