1. Adjustable Frequency You can adjust the frequency by turning the screw inwards or outwards until your dog shows the strongest reaction. The ultrasonic dog whistle can quickly stop barking and help train your dog to obey commands, such as sitting, shaking paws, or dropping objects. 2. AntiLost Design Our silent dog whistle features a quality round ring, a special locking nut, and a cover, ensuring you can carry it with you without worrying about losing it. 3. Dog Training Guide By setting different ultrasonic frequencies, you can easily teach your dog various commands. Keep the whistle commands consistent and reward your dog with treats when they respond correctly to reinforce obedience. 4. Effective Training Tool Your dog can hear the whistle from up to 200 meters away, even if they can't see you. If your dog or a neighbor's dog barks excessively, gently blow the whistle. The ultrasonic frequency will quickly capture their attention and stop the barking.