Dog Training Whistle with Ultrasonic Sound and Adjustable Frequency Pitch Perfect for Discipline Dog, Teach Dog Commands and Control or Stop Barking - Ideal for Professional Dog Trainers and Hunting New Pet Training Dog Adjustable UltraSonic Sound Whistle This is Pet Training Dog Adjustable UltraSonic Sound Whistle. Dog whistle with the dog (can also be used for other pet birds such as pigeons) to establish a good tool for communication and discipline. While using this product can produce ultrasound and spread very far. Within 3 Miles can be heard. Dog whistle will send a dog can detect ultrasound.