【Multifunctional Bark Control Device】Can be used as a dog training device to stop barking and effectively correct bad behaviors such as excessive barking, digging, eating dangerous food, fighting, and pulling on the leash. It also works as a repellent to discourage 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 barking control device generates ultrasonic waves with a frequency of 25 kHz. This frequency is safe for pets and has no effect on the human ear. Portable and Transportable: The dog barking control device is lightweight and easy to carry, so you can train your dog anywhere: at home, in the park, or in the car. It also prevents other dogs from approaching you while jogging, walking, or cycling and has an effective range of 5.2 m. 【With LED Flash and USB Charging】 Pressing and holding the button not only emits ultrasonic waves, but the LED flashes