High Decibel Emergency WhistleThis high frequency lifesaving whistle is made of stainless steel and has a louder voice. It is used in emergency situations and sports referees. The double tube can deliver up to 150 decibels. The crisp sound can be heard. a long distance. Emergency WhistleThis self-defense whistle can be hung by the lanyard, around the neck or by the key, and can be used at any time 150db High Decibel Double Tube DesignSimple and blow out quietly with loud sound. 30% energy saving than ordinary whistle. When you get separated from the team while hiking, you can give a quick signal. Stainless Steel Waterproof WhistleThe metal whistle can be used in any environment and wet weather, with excellent airflow design, it always works. It is very durable Wide UsesThe keychain whistle is not only suitable for emergency situations such as camping, hiking, hunting, fishing, boating and other outdoor activities, but also for dog training, school sports, competitions , lifeguards, etc.