【Ultrasonic Dog Training Device】 With the latest ultrasonic technology, Wango dog bark control device is suitable for dogs of all breeds and sizes. The ultrasonic frequency is harmless to both pets and humans. It can be used as a dog repellent and a dog training aid to stop bad dog behaviors, such as barking, digging, and endless fighting. 【Portable Anti Bark Design】 This dog bark control device is lightweight and fits perfectly in your pocket, suitable for indoor and outdoor use. With a wrist strap, it is designed to be convenient to carry with you. Press the button on this bark control device, it will emit an ultrasonic sound and meanwhile, the green light will indicate that the device is working, the red light indicates that the device needs to be charged. 【Rechargeable Dog Bark Control Device】 Our new version ultrasonic dog bark control device makes training your dog easier. Comes with the USB cable, the bark stopper can be fully charged in 5 hours and can work continuously for 15