Potty Time Chimes are bells that you hang from your door knob to assist in potty training your puppy. Chimes includes DVD that is less than 10 minutes long which goes over potty training using both the crate and Potty Time Chimes together. Perfect to sit down and watch as a family so that everyone is potty training the puppy the same way so that it gets potty trained that much quicker. Potty Time Chimes are adjustable so they will work for all puppies/dogs, small breed to large breed. Potty Time Chimes helps prevent scratching at the door and helps your puppy/dog communicate with you to let you know that they need to go outside to go potty.