Training instruction:1. Adjust the pitch and whistle agrave; your dog. But even dogs can't hear all frequencies(your whistle has a nut and screw that adjusts the frequency when turned). You may want towait until he is asleep and gently blow the whistle.2. Continue testing until; what your dog straightens up. You will then know that you have reached a frequency that he can hear.3. Use the dog whistle with variable sequences to train your dog. For example, a long burst can mean; "come;", while a series of short staccato bursts can mean; "sit;".4. Keep your whistle commands consistent and your dog will always know what you expect of him.Change your dog's behavior with; Training. For example, agrave; mealtimes, blow the whistle before they recede the food. It will only take a few tries before your dog gets good. Package: 2 * dog whistle with 2 straps;Note: The data is all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there are will have some color difference, depending on the physical object received Delivery Quantity: (according to the main image)