Portable and Convenient: The device size is about 13.5 x 6.7 x 3 cm (5.31 x 2.64 x 1.18 inches). It is portable and handheld. The ultrasonic dog deflector is especially suitable for outdoor work, outdoor travel and night security patrols, as well as all kinds of dog training. LED Flashlight: A super bright flashlight is a secondary weapon against the fierce dog. The dog anti-barking device has a super bright LED flashlight that can protect from the malicious dog when you are outdoors at night. The portable ultrasonic dog trainer can be an ordinary flashlight even at night. Easy to Use: The anti-barking device has buttons representing various functions. The portable and convenient handheld computer uses imported chips with excellent performance, low power consumption and long service life. The device is lightweight and easy to carry. Thanks to its portable design, you can put this portable device in your pocket. Ultrasonic Design: This ultrasonic dog repeller is based on the theory that the dog trainer can effectively train your dogs to obey and stop some unwanted behaviors such as barking, sitting, aggression and other obedience behaviors. The hand-held dog trainer helps you train dogs and control barking. Train your dog to behave well, stop scratching, digging, scratching, biting and stay away from furniture.