The double-barreled super loud waterproof emergency whistle blows easily and produces a high-frequency crisp sound heard from a distance. Keychain included Each whistle comes with a quality keychain loop that you can keep in your pocket or hang on your backpack. Durable and Portable Award-winning design, made of stainless steel, lightweight, very compact and easy to carry. Unique Design With excellent airflow design, it can be used in all-weather environments, such as rainy days, wet weather, etc. Versatile Use Can be used for camping, hiking, outdoor training activities, dog walking, coaches, referees, lifeguards, distress signals, and more. ; ;Cutout Design: The detailed cutout design makes the air vibrate more frequently, the sound is louder and spreads farther. Specification Material: Stainless steel ; ;Size: 5.7cm in total length, 1.7cm in width Decibel: 150 decibels Colour: Black Package Included ; ;2x Outdoor Survival Whistle