Easy Training: Simply adjust the frequency by turning the screw rod inward or outward until your dog shows the most noticeable reaction. Once you find the right frequency, our dog whistle ensures your pet will follow basic commands like a pro after training. Safe for Pets & Owners: Crafted from robust metal and durable plastic, the Howan dog whistle is designed for convenience and safety. Small in size and accompanied by a complimentary black lanyard, it's safe for your dog's hearing and completely harmless to humans. Professional Dog Training: Th dog whistle empowers you to effortlessly teach your dog or puppy unlimited commands. From stopping barking to sitting, coming, laying down, recall, and even toilet training, mastering new skills has never been easier. Adjustable Frequency: Since different dogs respond to various frequencies, our dog whistle produces a wide range of sounds between 5.4 KHz and 12.8 KHz when adjusted. This range is particularly sensitive to dogs' ears, while being virtually unnoticed by humans. Tips: The sound of the dog whistle isn't silent—it's just quieter than you might expect. While many people may not hear the whistle clearly, rest assured, YOUR DOGS WILL. They're much more sensitive to these frequencies compared to humans. So, there's no need to worry.