Strong enough: 7 oversized 1.5" metal bells and internal metal balls make a loud, clear chime that can easily be heard from another room, even when lightly touched by a dog. Easy to learn dogs : With simple training, most dogs are able to learn to ring a bell in about a day and fully trained to ring them for going out or going to the bathroom the next week. ADJUSTABLE LENGTH: Two snaps are designed to tighten the bell to different belt lengths, making it suitable for most door handle heights, large dogs and small dogs. . Sturdy metal bell: To prevent the puppy from chewing or visibly bending the dog training bell, and to prevent small metal balls from coming out of the potty bell, our bell for dog uses super strong metal. Effective Communication: Using a dog bell has proven to be an easier, fun, and win-win way for your dog to talk to you instead of talking to you. barking and scratching. .