Supreme Durability - These potty training dog bells are incredibly durable and made from a heavy duty nylon material. Potty Bells are the loudest metal doorbells available on the market today and ring loud and clear every time. ^Great Workout Device - Instead of Hearing the barking and scratching of the puppy bell, you hear the sweet jingle of potty bells, we provide an easier and better way for your dog to communicate. ^ Quickly and easily train almost any puppy, dog or adult dog to let you know when he or she needs to go. Our door dog training bells are the best choice. ^ Maximum Convenience - There is 1 dog bell. There are 2 bells at the bottom. Our high quality dog doorbell comes with a snap that makes it easy to use on any type of door handle. Small dogs, medium dogs, large dogs and large dogs all love our dog bells. A wonderful gift for you and your lover. ^Unique Handle Rivet - Our handle rivet is adjustable and can be tightened on any size door knob or hook, to ensure that