TIGREZY - High quality products and satisfactory customer service at a reasonable price Adjustable Frequencies: Different dogs respond to different frequencies. Our dog training whistle has a nut and screw that can adjust the frequency when rotated. Note your dog's reaction to each setting until your dog exhibits the strongest reaction. Easy Dog Training: This is a great tool to teach your dog obedience and learn basic skills. Train your dog with the ultrasonic whistle so you don't need to shout loudly. Effective Dog Training: Your pet can hear the whistle up to 25 meters away even if he can't see you. Train your dog with different commands and make him follow your instructions. (Sit, Paw, Lay Down, Up, Heal) Anti-lost Whistle: The body of the dog whistle is made of stainless steel coating with a protective cover to prevent dirt, damage and accidental loss. It is extremely easy to wear around your neck with our matching black lanyard. Note: Please note that this puppy training whistle