description: 1. An ultrasonic trainer that corrects dogs' uncivilized behavior by sending ultrasonic waves by pressing the transmit button. 2. The ultrasonic wave emitted by the ultrasonic trainer will stimulate the dog and make the dog feel panic, thus interrupting barking and preventing subsequent uncivilized behavior. 3. Continued use for a period of time will gradually improve the uncivilized behavior of dogs and develop good habits of civilized travel. 4. Aiming at the problem that the dog will adapt to the ultrasonic frequency, an ultrasonic frequency conversion gear is added. 5. The latest model of 2020, the ultrasound is strong, the airflow caused by sound waves is enough to blow out the flame of the lighter, the product is stable and reliable, and the dogs will respond within 5M specification: -Name: Ultrasonic dog training device -Battery: 4 AAA batteries (not included) -Effective distance: 5m -material: plastic -Colour: Black -Size: 95 * 33 * 42mm -Weight: 70g Be applicable: 1.Train various dogs 2. Police dog, pet dog, shepherd dog Packaging: 1 * Anti-barking Trainer