[Product name]: Adjustable pet training dog whistle [Product material]: Copper [Product size]: 5.3CM, diameter 6mm [Product introduction]: The dog whistle is one of the most practical gadgets to evoke dogs. This is a very different product from the flute we play. The dog whistle emits an ultrasonic wave that is not easily detectable by the human ear, but it is very obvious to the dog. This is because dogs ears can receive 120 kHz sound waves, while humans can hear up to 20 kHz sound waves. In addition to the tubular sound that humans can hear, the dog whistle also makes noises that cannot be heard by humans. Only dogs can hear the frequency. Ultrasound at this frequency can travel far, so dogs can travel far. Hear that tone somewhere. The dog whistle made with this dog's specialty is very reminiscent of a dog running away after chasing its prey. [How to use]: Loosen the sound adjustment screw. When injecting air from the air inlet, rotate the adjustment lever. After screwing in the adjusting rod, tighten the sound adjusting screw. Please note that the pitch mentioned here is not a loud sound, but a delicate sound of your dog. This can only be achieved through normal observation [Training Method]: Use different flute methods to issue commands such as "don't move", "sit down", and "come here". For example: "Don't move" Two short sounds "Sit down" One long and one short "Come here" Two sounds Long beep If you teach the dog these movements, he will play the flute according to the rules, and then teach him to do the appropriate movements; repeat the training and wait for the flute to play, the dog will know what to do. As a reminder, when your dog completes the action you specify, use appropriate dog snacks as a reward, and the training effect will be better