Adjustable ultrasonic frequency for dog training. The sound frequencies are between 25-30Khz which have been proved harmless for dogs' hearing and won't cause physical pain or distress. It is the most humane way to help train your dogs compared to electric shock collars, or liquid sprays. Different dog breeds may react differently to the ultrasonic sound. For optimal effect, Once the dogs have stopped barking or stopped the unwanted behaviours. Please congratulate and reward them, to make them understand what you expect from them.
