Versatile: The bell is suitable for all dogs of all sizes. Dog training: toilet training by simple repetition. High Decibels: The sound of the bell can be heard clearly within 26 meters and reminds the dog owner to open the door to avoid damage. Bite Resistant: Nylon rope with adjustable button, iron bell, prevent the dog from being snatched. Easy to install: This item easily hangs on all kinds of door handles or on a hook near the door. How does it work? 1. Access the workout. Hang the dog bell on the doorknob or hook near the door every time you go out, let the dog touch the bell every time you go out, give him a good reward, repeat several times, and he will make you every time ring the bell he wants out. 2. Puppy training. Hang the dog bell on the door handle of the dog latrine or on the wall next to the latrine. Let the dog touch the bell every time he goes to the toilet, give a good reward, repeat several times and he will touch the bell every time he tries to go to the toilet.