Dog Whistle, 2 PACK Ultrasonic Dog Whistle to Stop Barking Neighbors Dog, Professional Recall Dog Training Whistles, Adjustable Ultrasonic Silent Dog Whistle to Stop Barking Control Devices, Black LanyardPackage Include : 2 x Dog Whistle, 2 x LanyardsAdjustable Ultrasonic silent dog whistle training dog bark control tool how it works adjust pitch dog whistle to train your dog:1. Grab some snacks and go to a quiet room.2. Let your dog walk around without paying attention to it. Then whistle and reward your dog with treats. Teach your dog to associate a good thing with a whistle.3. Repeat each session 5 times and spread the sessions over a week.4. Focus on training and make this lightweight dog training whistle a part of you. Stop your dog from barking uselessly with the Silent Bark Control.5. Multiple frequencies adjustable, such as Audible Mode; where humans can hear, or you can change the frequency to "silent".Advantages and Features: Can be used for other animals, including cats, dogs, birds, etc. For dog owners to train, teach and control their dogs. For hunters to specifically train their dogs. Repel/distract annoying or dangerous dogs.