Supreme Durability - This dog bells for potty training is incredibly durable, which is made from heavy duty nylon material. Potty doorbells are the loudest metal dog door bell available on the market today and ring loud and clear every time. Great Training Device - Instead of hearing barking and scratching from the puppy bell, you hear the gentle jingle of potty doorbells, we offer an easier, better way for your dog to communicate. Quickly and easily train nearly any puppy, doggy or grown dog to let you know when he or she needs to go. Our dog training bells for door are the best choice. Maximum Convenience - There are 1 dog bell. The dog bell for door potty training has 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, big dogs and large dogs all love with our dog bells. A wonderful gift for you and your lover.