This dog training whistle is an ideal for training your dog. This Dog Training Whistle is made of solid brass and very durable. This Dog Training Whistle is easy to use and super sonic. Unique sound effect and frequency makes it a best aid for trainer.Dog Whistles above a small rings can be linked to key ring or hanging dogs neck. Long professional outdoor survival Silent Dog Whistle has adjustable pitch for active control of the frequency produced. When you blow on the whistle, you can hear the secondary sound made by the air forced through the metal tubing.The dog's behavior according to your instruction need to be trained. Such as, at meal time, blow on the whistle before they get the food. It will only take a few times of doing this and your dog will react quickly.