VARIOUS USES Suitable for referee, coach, training, teacher, sports, lifeguard, teacher, self-defense, survival, emergency, herd, bird or dog training, etc. . HIGH FREQUENCY DESIGNThe whistle has a large size, long propagation distance, loud sound, strong penetration and high recognition. At the same time, the sharp tone will not hurt the ears. The impact ranges from quiet to large. Depending on your method of whistling, the volume will change, the sound will be loud and clear, and easy to play. If necessary, you can quickly attract the attention of the crowd anytime, anywhere. . HIGH-QUALITY The corrosion-resistant tube is made of high-quality stainless steel, which is safe, smooth, durable and far superior to plastic. Cleaning treatment-our stainless steel pipes are neither rusty nor waterproof. This can guarantee the service life of the pipeline. At the same time, care must be taken to ensure that there are no sharp edges in the production process. For internal or external professionals, this is a successful tool. . EXCELLENT PERFORMANCEThe adjusted pipe can be comfortably held in the hand and can be quickly grasped. As a result, even if used for a long time, the hand will not cramp and tighten. Suitable for left-handed users. . PORTABLE DESIGN The whistle tube is made of stainless steel to prevent rust. There are two ways to use pipes: you can hang it around your neck to release your hand, or you can hang it on the key ring to avoid loss. .