Pet Dog Ultrasonic Anti Barking Device Handheld Dog Repeller Dog Behavior Training Equip Drive Control Device Bark Deterrents description 1. An ultrasonic trainer that corrects the dog's uncivilized behavior by sending out ultrasonic waves by pressing the transmit button. 2. Ultrasonic waves emitted by the ultrasonic trainer will stimulate the dog and surprise the dog, thus interrupting barking and preventing subsequent uncivilized behavior. 3. Continuous use for a period of time will allow the dog to gradually improve uncivilized behavior and develop a good habit of traveling civilized. 4. Our handheld anti-barking device can be used for dogs from 6 months to 8 years old. Through the frequency button, you can easily adjust the ultrasound frequency according to the condition of the dog. 5. Aiming at the problem that the dog will adapt to the ultrasonic frequency, an ultrasonic frequency conversion gear is added. Ultrasound is strong, and the airflow caused by sound waves is enough to blow out the flames of the lighter. specification: Material ABS Battery: 4 AAA batteries (not included) Effective distance: 5m Material: ABS Color: black, gray, army green Product size: 4.2 X 3.3 X 9.5cm Color box size: 11 X 4 X 6cm Bare machine weight (without battery): 41g Product weight (without battery): 71g packing list 1*Dog drive"