1. Dog Barking Control and Dog Training: Our ultrasonic dog repeller provides an effective solution for dog training and barking control. The barking deterrent can effectively train your dog to stop barking, digging, eating food, fighting and other bad behaviors. 2. Suitable for dogs of all sizes: The average hearing frequency range of humans is 20HZ~20KHZ, and dogs can hear a wider range of 15Hz to 120KHz. The ultrasonic barking controller emits 25-30KHz ultrasonic waves, so the sound will not affect humans, but can attract the attention of dogs. 3. Simple: The ultrasonic dog barking device fits your hand and comes with an adjustable anti-static wrist strap. The control range is about 5m16.4ft. As we use ultrasonic technology, it is suitable for dogs of all sizes. 4. LED indicator: When you press and hold the button of the barking control device, it will emit ultrasonic waves that only dogs can hear. The LED lights up green when operating. Press and hold the button for more than 10 seconds and the barking control will automatically turn off. Powered by 4 AAA batteries (not included). 5.Scientific Method: The stop barking device is friendly to both humans and dogs. The ultrasonic dog device completely protects your dog from cruel electric shock collars. Consistency and patience are key when training your dog, and remember to reward your furry friend with treats.