1.SUITABLE FOR ALL DOGS: Specifically engineered for canines, this anti bark device considers the hearing frequency range common to all dogs. It harnesses advanced ultrasonic technology, featuring three carefully designed ultrasonic frequencies tailored for dogs. These frequencies rotate across the three bands. This approach prevents dogs from getting used to a single frequency, maintaining the bark deterrent's longterm effectiveness. 2.AUTOMATIC ANTI BARK DEVICE: This innovative dog bark deterrent is engineered to automatically detect barking and emit ultrasonic waves, effectively silencing it. Whether it's your own dog, your neighbor's, or a stray, this device can help. It has a 33foot bark detection range and a 50foot ultrasonic coverage. Operating across three ultrasonic bands—1530KHZ, 20KHZ, and 30KHZ—it ensures effectiveness in various environments. 3.UNIVERSALLY APPLICABLE INDOORS AND OUTDOORS: Tested to be highly effective within a 33foot range, this anti bark device suits both indoor and outdoor use. Its durable ABS casing resists corrosion, dust, and water. You can easily install it outside without worry. Whether calming stray dogs or stopping your neighbor's pet from barking, it works reliably—even in rain, snow, or other harsh weather conditions. 4.HARMLESS AND SAFE FOR HUMANS: This anti bark device aims to craft a peaceful living environment for us. It silences dogs without any unpleasant side effects. There's no noxious smell, no electric shock, and no beeping noise, meaning it won't harm the dogs either. The device only emits ultrasonic waves in response to a dog's barking. These ultrasonic waves are customized according to the auditory range of dogs. As a result, humans can't hear them, and they have zero negative impacts on us.