Description: 【Professional Sports Whistle】: This whistle is great for referees officiating basketball, football, and volleyball matches. It's also suitable for sports teachers during training sessions. 【Loud and Crisp Sound】: The Emergency Whistle produces a high pitched sound that can be heard clearly over long distances, making it an great choice for outdoor activities and emergency situations. 【Portable Design】: With its compact size of 5cmx2.5cm/1.97inchx0.98inch, this Loud Crisp Sound Whistle is easy to carry around. You can attach it to your keyring or wear it around your neck for quick access. 【Material】: Made from reliable ABS material, this Referee Whistle is designed to withstand the rigors of sports matches and outdoor activities. 【Versatile Use】: Apart from sports events, this whistle can also be used as an emergency in outdoor activities like hiking or camping. Size Chart: 5cmx2.5cm/1.97inchx0.98inch Package Includes: 1 Sports Whistle(3 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.