When you can't make a sound,not that the whistle doesn't work,it's because you haven't adjusted the frequency properly.The correct usage method: You should unscrew the pole,continuously adjust the nut and blow it,adjust it to the most suitable response frequency for your beloved pet.Only then can you effectively training and summoning.
Dog whistle to stop barking neighbors dog.
Please refer to the details page to adjust the ultrasonic frequency of the dog whistle, which is more helpful for the puppy to understand.
Easily train the dog,sit down,shake hands,stop barking.