Honbay 4pcs Dog Training Whistle - Adjustable Pitch to Stop Barking Perfect for Any Breed STOP BARKING - Use it to call your dog or train to stop barking. Change frequencies since different dogs respond to different frequencies TRAINING WHISTLE - Teach your dog commands and let him learn basic hand movements while whistling different times for each command. TAKE CONTROL - Control your dog whenever he gets out of line and make it listen and obey. Once your dog learns the commands, you will have full control no matter hwere you are. FREE LANDARD STRAP - Great tool to have when you are training your dog. Dont have to worry about misplacing or loosing your dog whistle. The landyard detaches if you prefer to use only the whistle DIRT PROTECTION- Includes a cover that goes over the whistle so that it is not exposed and protected at all times. Keep dirt away from the whistle by using this plastic whistle cover