Color: sky blue Function key setting, you can turn off one of the functions or work at the same time. Product ultrasonic function principle: The barking dog is triggered for the first time. At this time, the work light will automatically light up, 19KHZ ultrasonic output will be emitted, the dog will respond, and the product will automatically reset to the start mode. the dog does not respond, it will enter the next function mode. When the dog barks for the second time, the light will automatically light up, 20KHZ ultrasonic wave and the dog will respond, and the product will automatically lock the second mode. If the dog does not respond, enter the next mode . When the dog barks for the third time, the light will automatically turn on and the 21KHZ ultrasonic output will be emitted. If the dog responds, the product will automatically lock the third mode. If the dog does not respond, go to the mode of function next. When the dog barks for the fourth time, the light will automatically
