Quantity: One piece Ultrasonic Dog Trainer Wango Barking Trainer uses the latest ultrasonic technology and is suitable for dogs of different breeds and sizes. Ultrasonic frequencies are harmless to pets and humans. It can be used as a dog repellent and dog training aid to stop bad dog behaviors such as endless barking, searching, and fighting. Portable Anti-barking DesignThe device dog barking controller is lightweight and fits perfectly in your pocket, suitable for indoor and outdoor use. Comes with a hand strap for easy carrying. Press the button of this barking control device, it will emit ultrasonic waves, while the green light indicates that the device is working, and the red light indicates that the device needs to be charged. Rechargeable Dog Barking ControllerOur latest version of the ultrasonic dog barking controller makes it easier to train your dog. Equipped with a USB cable, the anti-barking plug can be fully charged in 5 hours and can work continuously for 15 days. Compared with other similar products that require batteries, our products are more environmentally friendly and save money. [Dog Barking Effectively Stopped] Our barking control device has a control range of up to 16.4 feet and emits 24kHz ultrasonic waves. This sound does not affect humans (the hearing limit is 20kHz). Through beeping and ultrasonic sound, it can easily attract the dog's attention and improve bad behaviors. Continuous training is essential to achieve effective and lasting results. [Suggestions and Services] Whenever your dog does mischief by barking, leash, jumping, etc., just press the button and aim the ultrasonic dog training selector directly at it. Once he has a positive reaction, praise him and reward him to enhance his memory. High-quality product