Professional Training Whistle for Dogs: You can easily teach your dog unlimited commands by adjusting the different ultrasonic frequencies. Please keep your ultrasonic dog whistle command consistent to make your dog a listening and obedient friend. Dog Whistle Silent: Our high-rise bronze dog whistle is made of safe high-grade stainless steel, training your dog without any hassle. The dog whistle flock won't harm your dog's hearing during training sessions. Adjustable frequency: Dog whistles to stop barking are easy to use, just loosen the screw adjustment knob and turn the adjustment lever to obtain the desired ultrasonic frequency. Suitable for all dogs: Dog Whistle is a type of training tool that makes dogs come to you. It is suitable for all small or large dogs. You can get in touch with your dog at any time with the help of our silent dog whistle. Covering a perfect silent dog for humans: With this dog whistle to stop neighbors dog barking, there is no need to punish pets for training anymore. Training barking dogs in this way is easy, bringing huge changes to dogs and puppies, from slow to big minded, fearful to full of confidence. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.