【Multifunctional Bark Control Device】Can be used as a dog training tool to stop barking and effectively correct bad behaviors such as excessive barking, digging, eating dangerous food, fighting and leash pulling. Also works as a repellent to deter aggressive dogs from approaching you or your dog, and as a bright LED flashlight. Safe and Effective for Your Dog: This portable dog trainer uses ultrasonic technology, the dog bark control device generates ultrasonic waves with a frequency of 25 kHz. This frequency is safe for pets and has no effect on human ears. Portable and Portable: The dog bark control device is lightweight and easy to carry, allowing you to train your dog anywhere: at home, in the park, in the car. It also prevents other dogs from approaching you while you are jogging, walking or cycling, with an effective range of 5.2m. 【With LED Flash & USB Charging】Pressing and holding the button will not only emit ultrasonic waves, but the LED will flash quickly and stop the dog's