Description: Training Door Bells: Using dog bells allows your dog to communicate they are ready walking without shouting. This is an easy solution to toilet training and keeping home mess. 7 Doorbells: With bells are made of durable metals to provide great sound quality. The bells make a loud sound, let you notice the dogs needs, and solve them in time. High Quality: can easily hang this dog doorbell from door knob or attach to a sliding door handle. Convenient on, off door as needed. Train Your dog: dog doorbell is very convenient use, fun to interact with your puppy, effectively train dogs and let them know that they walking out long ring bells, solving their physiological needs in time. Adjustable Height: Buttons design, adjustable 30inch to 31inch suit size dog. Great for large and small dogs! can adjust the hanging height of the doorbell according to dogs size. Specification: Material: Polyester Length: 33inch Package Includes: 1 Doorbell(4 Pack) Note: Please allow slightly errors due to manual measurement and different monitors.