Effective device for controlling the bark of dogs: This automatic ultrasonic bark control uses the improved technology of 2024, with Upgraded 4 powerful ultrasonic emitters and 3 adjustable frequencies, keeps your own dog or your neighbour's dog from barking. More effective than the old version deterrent.Safe for you and your dog: Ultrasonic frequencies are harmless to pets and completely inaudible to the human ear. Trust from dog trainers and veterinarians. If the dog is hearing impaired or aggressive, the device may not work as expected. It is not recommended to use one device against two or more barking dogs at the same time.IP45 Waterproof Dog Barking Box: This device adopts an IP45 material waterproof shell, and the professional waterproof design allows you to use the anti dog barking device without worrying about weather factors. For some sudden weather conditions, such as rain and snow, the dog barking silencer can still work normally in these bad weather conditions, freeing your hands and bringing great convenience to you.Charging & Portable: This dog barking box is equipped with a 1500mAh rechargeable lithium battery, which can work for 30 days after 5 hours of charging. The shell material is sturdy and durable, without the need for other complicated operations. You can install it on a tree, in a dog house, on a table, or anywhere else you find it convenient to use. You can also carry it with you during outdoor activities for outdoor use.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 make the dog quiet but do not hurt dogs and people.