High-quality environmentally friendly dog whistle: The simple and natural dog whistle is made of stainless steel and has a protective cover to prevent dust, damage and accidental loss. The dog whistle is carefully made without cruelty, and the safety test is carried out with your pet. .Training Whistles: Different dogs have different reactions to different frequencies. Our Training Whistles has a nut and screw to adjust the frequency as it turns. Pay attention to your dog's response to each setting until your dog shows the strongest response. .Best Training Dog Whistle: This Dog Training Whistle is an excellent training aid for any dog of any age. It ensures that your dog can hear clear signals and commands everywhere, and you can keep them focused during training Ask your dog to stop barking according to your instructions, sit down, come over, lie down, and toilet training. .Anti-lost whistle: You will get a pair of matching braided lanyard straps and our Dog Whistles, allowing you to easily hang Dog Training Whistle around your neck to prevent you from losing your whistle. .Note: Please keep your whistle commands consistent. If your dog responds positively, you should reward your dog. This product will not allow your dog to immediately understand your instructions. You should train your dog to do this. The best training effect is when dogs are 3 to 7 months old. .