Pet Parade Ultra anti-bark device detects puppy and dog barks from 16 ft away. Once detected, it will automatically emit high-pitch sounds only dogs can hear. Once the barking stops, so will the sound. Multiple functionalities include 2 sensitivity levels. Great for training purposes with all breeds of dogs 6 months and up! This is a necessity for foster pet parents, new pet owners, and those with vocal dogs, especially for people who live in apartments. Easy installation and battery operation. Requires a 9 Volt Battery (not included). Easy installation. Includes hardware for a wall mount. 9 Volt Battery (not included).