Features. Professional dressage whistles: You can easily learn to play. Give your dog an unlimited number of commands by adjusting the different ultrasonic frequencies. Be careful what is the control of your whistle? Ultrasound for dogs is consistent to make your dog an obedient and submissive friend. Dog whistles are silent: Our dog whistles are made of high quality stainless steel and allow you to fully train your dog's safety. and without any problems. The dog whistle will not harm your dog's hearing during training. Adjustable frequency:The Stop Bark dog whistle is easy to use. To use, simply loosen the sound adjustment screw and turn the adjustment lever to achieve the desired ultrasonic frequency. Suitable for: all dogs:The dog whistle is a training device that you can use to train your dog. Your dog that you can come to; YOU. It is suitable for all dogs, large or small. With the help of our silent whistle, you can contact your dog at any time. Cover a silent dog perfect for humans: With this dog whistle, you can prevent your neighbor's dog and you from barking You no longer have to punish your pet to train it. Training barking dogs in this way is easy and produces a dramatic change from apathy to apathy in dogs and puppies. a great mind and fear of complete self-confidence. Specifications. Colors: 1 set of black and 1 set of white (colors can be freely combined) Product category: sound toy Material: stainless steel Weight: 30g Product list.< br />1*Pet whistle