【Ultrasonic Design】Based on the theory that dog trainer can effectively train their dogs to be obedient and discourage unwanted behaviors such as barking, digging, chewing and more. In addition, both are intended for humans and pets and the sound is only audible to pets. 【LED Flashlight Function】The super bright LED flashlight function is useful for walking or jogging at night and also works as a battery indicator. 【Multifunctional】3 in 1 anti-barking device. In addition to being a pet training tool, it can also protect you from dog attacks. It is suitable for training many kinds of dogs, suitable for outdoor work, travel and night security patrol. 【Convenient to carry】The dog bark controller confirms the ergonomic design, portable and practical, also convenient to carry with you, e.g. B. jogging or hiking, cycling, parking, etc. With adjustable shoulder strap. Portable.