【Dog Barking Control and Dog Training】Our ultrasonic anti-barking device provides a safe and effective solution for dog training and barking control. The anti-barking device can effectively train your dog to stop unwelcome behaviors, such as fighting, barking, digging, eating unsafe food, etc. • Upgraded Version 3 In 1 Control Devices】Barking control device has 2 different levels, One-button operates. It has a standard frequency of 25kHz and a variable frequency of 25kHz to 30kHz.Red dots can be emitted from the other end of the cat training Aid device. • 【Suitable for Dogs of All Sizes 】The average human hearing frequency range is 20HZ~20KHZ, and the range that dogs can hear is from 15HZ to 120KHZ. Ultrasonic Bark Controller emits ultrasonic waves at a frequency of 25KHZ, so the sound will not affect humans, but can attract the attention of dogs. • 【700mha Rechargeable Battery】You don't have to prepare AA batteries any longer, save the trouble of replacing batteries when in use. and leave a smaller carbon footprint. The 700mha rechargeable battery we used in the Ultrasonic Dog Bark Deterrent . You could use it for 4 months without charging it ( making sound for 1 min/day ). And dog barking control device would indicate its low power status, then you should charge it for 3 hours and work for more 4 months. • 【Easy to Use】When you press and hold the button of the SZBOKE ultrasonic barking control device, it will emit ultrasonic waves that only dogs can hear. When the device is working and emitting ultrasound, the LED indicator will light up in green. Press the button for more than 1 second, the device will automatically turn off. • 【Better Technology, Better Communication, Better Results】SZBOKE is committed to establishing better communication channels for humans and pets. With this anti-barking device, every time your dog bites, jumps, pulls the leash, etc., just press the button, and then directly aim the ultrasonic dog trainer at him. When he reacts positively, praise and reward him. Then he will understand what kind of behavior is unacceptable.