ITEM NAME:4-Pack Dog Whistle Professional Dog Training Whistle Stop Mania Adjustable G5K4 4-Pack Dog Whistle Professional Dog Training Whistle Stop Mania Adjustable G5K4 Convenient day training - Adjustable to a variety of frequencies, such as voice mode; if you can hear, humans can also change the frequency to "silent", so the whistle can hear the dog's voice, but not humans. It is easy to teach your dog's orders, such as sitting, coming, stopping blows, storing, etc. Pet Dog Safety - Our silent whistle does not hurt the dog's ears, using silent dog control to prevent the dog from usingless roar. High-quality production - Our high-pitched dog whistle is made of high-quality metal for long-lasting rust prevention. Easy to carry - Light weight, just 8.00 cm, you can put it in a key chain or pocket. Focus on training and make this lightweight dog training whistle a part of you. product information Colour:Black + white + blue + orange Material:metal Size:Rope length: 42cm, whistle: 8cm Package Contents: 4 * whistle Note - This silent dog whistle sounds out, you may not hear it, but the dog will hear it Note: Can be used for other animals, including cats, birds, etc. 2. The dog owner trains, coaches and controls the dog. 3. Hunters specialize in training their dogs. 4. Resist / interfere with irritating or dangerous dogs. Note: Remove the cover to expose the adjustment sound quality. Blow air from the inlet while rotating the adjustment rod. 2. Adjust the pitching and whistling to the dog. Wait for them to sleep, gently shake the whistle. Your whistle has a nut and screw that adjusts the frequency as you turn. Continue testing until your dog is tightened. Then you will know that you have reached the frequency they can hear. After adjusting the lever, tighten the screws. 3. Train your dog with dog whistle with different surfaces. For example, a long burst may mean "coming," and a series of staccato outbreaks may mean "sitting." 4. Keep the whistle ord