Effective and safe anti-bark device: ultrasound Dual frequency combines a standard frequency (24 kHz) and variable frequencies (24 kHZ-30 kHz). Our automatic barking device ultrasound for dogs is used in a wide range of dog breeds to stop barking more effectively. The anti-bark device for dogs can also help you stop barking. train your dog and correct bad behaviors such as barking, biting, picking up garbage, digging, etc. Easy to control; UseOur dog barking devices are made of ABS material, safe and durable. Dog bark deterrents are easy to use. To use, you just need to press and hold the button, it will emit ultrasound to attract the dog's attention and prevent your dog or neighbor from endless barking, digging, fighting and to chew. Repeated training can achieve effective and long-lasting results. Portable design: the anti-bark device is compact and lightweight. Easy to use carry when you walk your dog, walk or run. The effective range up to 5 m, which is perfect for training your dog. home or away the exterior. It can also prevent other dogs from approaching you while jogging, walking or running. Rechargeable dog training device: Our anti-bark devices for dogs are equipped with 'A built-in 1200 mAh rechargeable lithium battery that supports charging via USB cable. More ecological and more sustainable. 8 hours of continuous operation per full charge. Red light means charging, blue light means fully charged. Note: The output current does not exceed 2 A. Safe and harmless anti-bark dog stopperThe anti-barking device with ultrasound for dogs uses advanced technology 24kHz-30kHz ultrasound, no electric shock, no liquid or spray, which has no effect on human health. pets and humans. It is quiet for humans (humans can only hear sounds from 20 Hz to 20 kHz), but dogs can hear sounds from 15 Hz to 20 kHz. 50 kHz, it will attract the dog's attention and stop its bad behavior.