Cevinee Loud Version Portable Brass Emergency Whistle, Classic EDC Tool Collection, Mini Survival Whistle with Key Chain Pocket size and light weight for daily use. Made of high brass. Surface polished finish and anti-oxidation coating. With a key chain on the top, convenient to take along. Special quick airflow design, easy to whistle and make a loud sound in the open air. Perfect for Pet trainers, Coaches, Referee, Officials, Football Coach,Basketball, Soccer, Hockey, Lifeguard,etc.