Zacro Dog Bells and One Set of Free Training Clicker. Dog Doorbells for Dog Training and Housebreaking Your Doggy. An Easier, Better Way for your dog to communicate; Instead of hearing barking and scratching, you hear the gentle jingle of Zacro Bells; All dogs have to go doorbells and you can housebreak and teach them how to signal you when they have to go;What's better than hearing the polite chime of our Zacro Bells when your doggie needs to use the bathroom? Hang Zacro Bells from Any Doorknob or Handle; Our high quality doggie 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 our dog bells Nylon doorbell strap and 7pcs 1.4" Extra Loud stainless stell Bells; Don't worry your dog won't have an accident because you couldn't hear the bells when they rang them; Zacro Bells are the loudest metal dog doorbells available on the market today and ring loud and clear every time One quality dog training clicker set provided with training guide manual Adjustable door bell length for small, medium and large dogs to use on any type of door handle