Principle of Dog Whistle: The dog whistle is transmitted through the principle of high frequency sound, dog can receive 120 KHZ sound waves, while the human can hear about 20 KHZ, the difference is here! So the sound of a dog whistle is undetectable, but dogs are sensitive. The real Dog Whistle are not loud, but there are "sniffed" high-frequency sounds. There are many whistles in the market that pretend to be a dog whistle. Don't make a mistake~ The role of the dog whistle: The dog whistle is actually used as a training sign. Such as: "Stay" ------ two short notes "Sit down" -------- one short & one long note "Come here" ------ two long notes ---Dog Training Clicker--- The clicker is usually like a matchbox size, with a spring lamination in it. Press down and let loose, there will be a short and clear "ka da" sound. Essentially, clicker makes “ka da” sound as a link between behavior and reward, without any blame or punishment. Mark the behavior of the dog and gradually cause natural reflex reaction, let the dog make a choice in the pleasant by itself. Be active and accurate to act following the clicker sound and be rewarded, bad behavior without reward will gradually disappear.