With this dog whistle you can generate tones with frequency from 1Hz to 25000Hz. There are three preset modes for you to easily train your dog in this dog whistle, the three preset training modes are COME, STOP and TURN. Also with the dog whistle you can stop your or your neighbor's dog from barking. The training lessons in this app contains the training tips, you can train your dog with these lessons and in the same time use the dog whistle.