Keep unfriendly dogs away: this product is mainly used for ultrasonic dog carriers outdoors to prevent attacks by dogs. This anti-barking device can be used anywhere: jogging or walking, cycling, in the park, in the car. 100% safe ultrasonic function: based on the theory that ultrasound, the dog trainer can effectively train your dogs to be obedient and stop some unwanted behaviours such as barking, digging, chewing and more. Physical methods to stimulate and have dogs no effect on the health of dogs. LED torch function: the flashing of the super bright LED can also make the dog clear the source and position of the sound to understand that the weapon is against it. The longer you stay in this position, the more it panic and the faster it gets. Handheld and practical: the dog training device is approx. 5.3 x 1.5 x 0.8 inches and fits comfortably in your pocket. It comes with a lanyard that you can easily take it anywhere, e.g. jogging or cycling, hiking, parking, etc. Easy to use: On the anti-barking device there are buttons that represent different functions. Details can be found on the picture or manual. Requires a 9V battery (not included). Suitable for most common small, medium and large domestic dogs. Keep the dog from approaching you before he can bite you. A good protection for yourself.