【Ultrasonic Design】Based on the theory that dog trainers can effectively teach their dogs obedience and discourage undesirable behaviors such as barking, digging, chewing, and more. In addition, both are designed for humans and pets, and the sound is audible only to pets. 【LED Flashlight Function】The super bright LED flashlight function is useful when walking or jogging at night and also functions as a battery indicator. 【Multifunctional】3-in-1 anti-barking device. It is not only a pet training device, but also can protect you from dog attacks. It is suitable for training many dog breeds, outdoor work, travel, and nighttime security patrols. 【Comfortable to Carry】The dog bark controller features an ergonomic design, is portable and practical, and is also convenient to carry, e.g., while jogging or hiking, cycling, parking, etc. With an adjustable shoulder strap. Portable.