Does Outdoor Pet Anti Barking Control Device Ultrasonic Dog Bark Deterrent work? Will it cause harm to the dog?

It is effective to use Outdoor Pet Anti Barking Control Device Ultrasonic Dog Bark Deterrent to stop dogs from barking and barking. Its working principle is that a high-precision dog barking sensor is installed in the anti-barking device. When the dog's barking sound is sensed, the sensor is automatically triggered, so that the anti-barking device emits ultrasonic waves to stimulate the dog. The dog achieves the purpose of stopping barking. Below, there is a real effect video demonstration.
As you may have seen, the word "stimulus" appeared above. However, I hope everyone understands the meaning of this word correctly. The sound wave frequency range heard by normal adults is 20HZ-20KHZ, and the sound wave frequency range of dogs is 15HZ-120KHZ. Dogs cause hearing damage.Outdoor Pet Anti Barking Control Device Ultrasonic Dog Bark Deterrent is your good choice.