A. Effective device for controlling the bark of dogs: This automatic ultrasonic bark control uses the improved technology of 2025, with 4 upgraded powerful ultrasonic emitters and 3 adjustable frequencies, which can help keep one's own dog or a neighbour's dog from barking. It is more effective than the old - version deterrent. B. Safe for you and your dog: Ultrasonic frequencies are generally considered harmless to pets and completely inaudible to the human ear. It has the trust of dog trainers and veterinarians. However, if the dog is hearing - impaired or aggressive, the device may not work as expected. It is not advisable to use one device against two or more barking dogs at the same time. C. IP45 Waterproof Dog Barking Box: This device adopts an IP45 material waterproof shell. The professional waterproof design allows users to use the anti - dog barking device without having to worry too much about weather factors. For some sudden weather conditions, such as rain and snow, the dog barking silencer can still work normally in these adverse weather conditions, freeing hands and bringing convenience. D. Charging & Portable: This dog barking box is equipped with a 1500mAh rechargeable lithium battery, which can work for about 30 days after 5 hours of charging. The shell material is sturdy and durable, without the need for other complicated operations. It can be installed on a tree, in a dog house, on a table, or anywhere else that is convenient to use. It can also be carried during outdoor activities for outdoor use. E. Suitable for all sizes (breeds) of dogs: When the microphone detects a dog barking, the automatic ultrasonic anti - dog barking device will automatically emit ultrasonic waves, which can make the dog quiet without harming dogs and people.