Correct the dog's bad behavior. This ultrasonic bark deterrent can be used as a training device to help train your dog to be obedient and develop good behavior. Lightweight and portable. Small and lightweight, this dog bark stop fits perfectly in your pocket and comes with a wrist strap for easy portability. Lightweight and portable. Suitable for dogs of many sizes (except dogs under six months and aggressive dogs). Press the button and the barking controller starts to work, with an effective range of 5 meters. (16.4 feet), all dogs within range could hear the ultrasound and make movements. After 10 seconds of pressing the button, the green light turns off and the bark controller turns off. Dog training aids. This ultrasonic anti-barking device can effectively train your dog to stop unwanted behavior, excessive barking, digging, chasing, eating dirty or fighting. If you are bothered by your dog's bad behavior, such as braking to passersby, defecating in the open, eating dirty food, eating from strangers, or fighting. You need this ultrasonic dog brake control, training aid. This dog trainer is a good choice for gentle barking control. When excessive barking is causing problems, ultrasonic barking control devices are one of the gentlest ways to get a dog's immediate attention - instantly disrupting the barking behavior without causing any harm to the dog. caution: 1. This product may not be effective for dogs with hearing problems. 2. Dogs under 6 months old cannot be used. 3. Not intended to provide protection against aggressive dogs. 4. Use within 30 cm (12 inches) of the human ear. 5. Different dog breeds may respond differently to ultrasound. 6. For best results, use this product as a training aid and other tools/commands. Be patient during this training process. 7. Build an early relationship with the dog before using the product. 8. When the dog is quiet, reward the pet, guide it positively, and enhance the dog's memory. Train and correct patiently.