[Advanced Dog Training and Behavior Aid]: Using the latest ultrasonic technology, the anti-bark device automatically emits a high-pitched sound that only dogs can hear. It automatically detects a dog's sounds, and when the dog stops barking, the ultrasonic bark control device automatically stops emitting ultrasonic waves. [Anti-bark Device for All Sizes and Breeds]: The anti-bark device has 4 sensitivity levels to choose from. You can set the environment with the most suitable device, select the detection distance, and adjust the sensitivity to achieve your goal. Level 1 is the least sensitive, while level 4 is the most sensitive. [Safe for Dogs and Humans]: The dog bark control device does not emit electric shocks, emit irritating odors, or beep, making it safe for both pets and humans. The anti-bark device automatically emits ultrasonic sound to stop dogs from barking: ideal for leaving your dog alone when you go out. Dogs remain calm, creating a peaceful environment for you, your