Function description: An ultrasonic trainer that corrects the dog’s uncivilized behavior by pressing the launch button to emit ultrasound,The ultrasound from the ultrasonic trainer stimulates the dog and makes the dog feel surprised, thereby interrupting barking and preventing subsequent uncivilized behavior, continuous use for a period of time will make the dog gradually improve its uncivilized behavior and develop a good habit of civilized travel Features: 1. In response to the problem that dogs can adapt to the ultrasonic frequency, the ultrasonic frequency conversion gear has been added 2. Ultrasound is strong, and the airflow caused by sound waves is enough to blow out the flame of the lighter Product specifications: 1. Material: ABS 2. Battery: 4 AAA batteries (not included) 3. Effective distance: 5 meters 4. Product size: 4.2×3.3×9.5 cm 5. Bare machine weight (without battery): 41 grams