Suitable for dogs of all breeds sizes, it can effectively block the barking of your dog or your neighbor's house, prevent the dog from barking at a certain time, the ultrasonic bark controller has an effective distance of 25 feet. Outdoor ultrasonic bark control device has 3 adjustable ultrasonic range levels test mode: low range, medium range, high range, test mode (for verifying the function of microphone speaker) The ultrasonic frequency is harmless to pets is completely inaudible to the human ear. It provides a safe effective training tool for your dog or neighbor's dog to stop barking. Valid for most dogs in the range. The anti-bark device is durable waterproof. It can be hung on trees, walls or fences to prevent your own dog or neighbor's dog barking can be used indoors outdoors. The new dog barking controller uses a carefully designed mini shape that is easy to place hide. The two-color indicator shows if the electricity is fully. When the outer bark control is within range of a barking dog, the microphone picks up the sound the device is automatically activated. The outer anti-indent control emits an ultrasonic sound. (Ultrasound noisecan from dogs, but is mute to humans)Products from BAZHOU's store