Handheld & Practicality: The size of the device is approximately 13.5 x 6.7 x 3 cm (5.31 x 2.64 x 1.18 inches). It's portable and hand-held. The ultrasonic dog deflector is particularly suitable for outdoor work, outdoor travel and night securitypatrols, as well as all types of dog training. LED flashlight: A super bright flashlight is a secondary weapon against the fierce dog. The anti-dog barking device has a super bright LED flashlight that can protect from the malicious dog when you are outdoors at night. The handheld ultrasonicdog trainer can be an ordinary flashlight even at night. Easy to use: The anti-barking device has buttons that represent various functions. The portable and practical handheld uses imported chips with excellent performance, low power consumption and long lifespan. The device is light and easy to carry.With portable design, you can put this handheld 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 obedience and stop some undesirable behaviors such as barking, sitting, aggression and other behavioral obedience. The handdog trainer helps you to train dogs and bark controls. Train your dog on good behavior, stop scratching, digging, scratching, biting, and staying away from furniture. Safe for humans and pets: This dog training device can activate visual and additive activation of dogs, cats and other animals, but does not affect humans The handheld ultrasonic dog repeller and trainer device uses physical methods to stimulate dogs.The ultrasonic bark control emits ultrasonic sound around 35 to 45 Hz, making it safe for people and pets.