2023 Newest Bark Control Device Ultrasonic Anti Barking Device Stop Dog Bark Ultrasonic Level Control Sonic Bark Deterrents 50FT Range Effective device for controlling the bark of dogs: this automatic ultrasonic bark control uses the improved technology of 2023 and keeps your own dog or your neighbour's dog from barking. More effective than the old version deterrent. With 3 adjustable frequencies. 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. USB rechargeable and waterproof: the ultrasonic anti-bark device has a well-designed mini owl shape. Designed for easy hanging/mounting on a tree, wall or fence post to prevent dogs barking. Ultrasonic anti-barking devices automatically detect barking from a distance of up to 25 feet. Suitable for all sizes (breeds) of dogs: the Zigzagmars bark control device automatically emits safe sound sounds that dogs can hear clearly but do not hurt dogs and people. Suitable for most dog breeds and sizes, except for dogs with hearing problems or under 6 months. If you have any questions, please contact us. We will give you a satisfactory answer within 24 hours. We do not recommend it for dogs under 6 months and over 8 years.