[ Bark control device ] : Introducing a versatile and effective bark deterrent that uses harmless sound waves (15-30khz) to stop dogs. This bark deterrent is suitable for most dogs between the ages of 6 months and 8 years. Dogs are highly sensitive to the sound waves emitted, ensuring they quickly stop unwanted behaviour[Auto bapking dog deterent]: After turning on the switch, the anti barking device will be in working standby mode, when the dog is heard to make abnormal growling, the product automatically sends out the ultrasonic frequency, at this time, the blue light is always on for 5 seconds, to stop the dog from barking, and then it automatically enters standby mode after 5 seconds[Easy to install]: Ultrasonic dog bark deterrent is very easy to install, can be hung on the wall, table, tree or placed in the garden and other places, when the neighbour's dog sends out abnormal howling, the product automatically sends out the ultrasonic frequency, dog whistle to stop barking neighbours dog, when going out camping also You can carry it to prevent bad dogs from disturbing outside the campsite[Product design]: Anti barking device for dogs set three kinds of ultrasonic frequency, respectively: sweep mode 15KHz-30KHz, fixed frequency 20KHz, fixed frequency 15KHz, rotary switch pointing to OFF for off state, pointing to the different modes will send out different frequency sound waves, sweep mode refers to the ultrasonic shape in the 15-30khz Sweep mode means the ultrasonic waveforms are automatically switched between 15-30khz, which is beneficial to different dogs, and fixed frequency mode means the ultrasonic waveforms are fixed[2 hours charging] This no more bark dog training device is equipped with a 1200mAh battery for long time use. When the battery is low, only red light will be shown after switching on the device, the red light will be always on when charging, and the red light will be off when it is fully charged.