?????? ULTRASONIC ANTI-BARK DEVICE - Most dogs are stimulated by 25kHz ultrasound from this anti-bark device to interrupt unwanted behavior such as barking, digging, fighting, biting, etc. With continued use of anti-bark devices for dogs, dogs can gradually develop civilized behavioral habits. ????? ALL-IN-ONE BARK CONTROL - Just press one button, the dog bark control device will emit ultrasonic sound to attract dog's attention. The anti-bark device supports a long daily use time of up to 5 months with only 5 hours of charging without the need for frequent battery replacement. ????? PORTABLE AND PORTABLE - The portable dog bark control is portable to carry around when you take your dog, walk or run. The effective range is 16.4 feet, perfect for training your dog at home or outdoors. It can also deter other dogs from approaching you while jogging, walking or running. ????? SAFE FOR DOGS OF ALL SIZES - Ultrasound is harmless to pets and completely inaudible to human ears, a fact recognized by dog trainers and veterinarians. The anti-barking device can be effectively used on various dogs, which can scientifically and effectively train dogs to develop civilized behavior. ????? CUSTOMER SERVICE - The dog bark stopper can help you train disobedient dogs, give up bad habits, and be safe and reliable. We will solve your problem within 24 hours if you have any questions about the anti-bark device. We hope you and your pets are happy with the bark control device.