Description "Training instruction: 1. Adjust the pitch and whistle agrave; your dog. But even dogs can't hear all the frequencies (your whistle has a nut and screw that adjusts the frequency when turned). You might want to wait for him to sleep and blow gently on 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 at it. Product Name: Pet Whistle Product Material: Metal Product size: 0.7 * 8.0cm Package: 2 * dog whistle with 2 straps"