1. quality scientific training whistle: Wellconstructed, this metal whistle will not rust or break. Our silent dog whistle emits ultrasound that you may not hear, but dogs can. Note that this whistle won't make your dog understand commands immediately—patience is key! 2. Adjustable ultrasonic whistle: Featuring multiple frequencies and a finer frequency range, this ultrasonic dog whistle allows you to teach your dog various commands, such as stopping barking, sitting, and staying. More frequencies mean better results for dogs of all ages. 3. Ecofriendly dog whistle with soft tape: Our team prioritizes the environment we live in. The wider 18' lanyard ensures a more comfortable neck experience, preventing scratches. After rigorous tests and user feedback, we finalized this design for performance. 4. Easy and effective dog training: This method is simple, making a big difference for your beloved pets. Your dog can hear the whistle up to 30 meters away, even if they can't see you! Whether you have a Poodle, Husky, or Border Collie, this silent whistle is the tool to help them follow commands and master basic skills.