This Dog Training Whistle is designed for dog training, the frequency produced isn't affected by a person, but is very useful for dogs, it will sit up, come here, eat, sit down, etc…

• A plastic sleeve protects the adjustment area
• Great for recall over long distances
• Key ring loop included
• Specification:
• Material: Metal & Plastic
• Package Includes:
• 2x Dog Whistles （Random Colors）

PLEASE BE AWARE OF THIS FACT THEY ARE NOT TOTALLY SILENT.
Speak Before You Whistle
After you've chosen your whistle, the next step is to train your dog. If your dog hasn't been trained to respond to your voice commands, he won't be able to respond to a whistle since there's nothing to associate the whistle with. He'll need to learn the recall command of "here" or "come" as well as "sit." When your dog has mastered those two actions at your prompting, you're ready to add a whistle into the mix.