Practical and Helpful: each training whistle produces a clear and loud sound; When you blow your whistle, others will quickly find your position Sports whistle has a detachable black lanyard, lightweight, easy for you to carry The metal whistle with the lanyard helps you release your hands from holding it, a helpful and practical toolFlexible to Use: comes with a comfortable nylon lanyard for each metal sports whistle so that you can hang around your neck or hang on the wall, allowing your hands to do other things flexiblyDurable to Use: made of metal, the sports whistle is durable and can be applied for a long time; The surface is smooth, bringing a safe and convenient using experience to youSufficient Amount: you will receive 3 pieces of referee training whistles, the amount is enough for you to meet daily using and replacement needs, can be shared, enjoy the convenience togetherWidely Application: these loud sound whistles can not only be applied in a variety of sports events, such as running, hiking, camping, tennis training, etc , but also for fans calling for their idols and outdoor emergencies, versatile to use