Quantity: 3 pieces Excessive barking from your dog can be a little frustrating. If they have not received training, it is almost impossible to calm them down. Training your dog to remember is one of the most important things any pet owner should do. One of the best and easiest ways is to use a dog whistle. This set of 3 high frequency training whistles is suitable for reminding working dogs and domestic dogs. This dog whistle will help you control dog barking easily and effectively. The frequency of this whistle is so high that only dogs can hear it, so you don't have to worry about annoying high-pitched noises. This dog training whistle is a great tool to promote effective barking control. Professional dog whistle: you can adjust the height to get the appropriate frequency, loosen the sound adjustment screw while blowing from the air inlet and turn the adjustment lever to set the optimum height. Turn the adjustment lever and tighten the sonic adjustment screw. This dog whistle can be used for any breed of dog. Like all silent whistles, this professional dog whistle makes a considerable noise. For some people, it feels like escaping air, like blowing a straw. Others heard a very faint hiss, like a teapot starting to boil. It's a great way to hear your voice while you train your dog and teach him to obey. When your dog does this thing correctly, give him snacks and make your dog a listening and obedient friend.