Function description. An ultrasonic trainer that emits ultrasonic waves by pressing the launch button to correct the uncivilized behavior of dogs. The ultrasonic waves emitted by the ultrasonic trainer will stimulate and surprise the dog, thus interrupting the barking and preventing subsequent uncivilized behavior. With continuous use for a period of time, the dog will gradually improve its uncivilized behavior and develop a good habit of traveling in a civilized manner.Product selling point. 1. In response to the problem that dogs can adapt to the ultrasonic frequency, an ultrasonic frequency conversion gear 2 is added. The ultrasonic wave is powerful, and the sound wave causes the airflow to blow out a lighter flame3. The function is single, the product is stable and reliable, which is conducive to reducing bad reviews4. Rechargeable model, long standby time