Ultrasonic dog repeller dog training device handheld dog repellerPet 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.