[ Durable and Safe Material] Dog bells is made of heavy duty nylon material which is sturdy durable and chew resistant. The strap is environmentally friendly, safe, non-toxic and odorless, and will not cause any harm to your pet. And bell is made of blend of metals that is loud and crisp,it can be heard through door and wall. [Adjustable Length] The length of puppy doorbells can be adjusted easily according to your pet size. From the the length 33" to 43". [Effctive Training Device] With the simple training guide, Dog bells is an easier, better way for your dog to communicate! Teaching pet to ring a bell to go out out or go to the toilet instead of scratching on the door and bark to get your attention. Use a gentler way to build intimacy between you and your pet. [Clear and Loud Hard Bell] The bells are made of high-quality stainless steel, the sound is loud and crisp, and it is not easy to be bitten by pets. Extra loud sound will get your attention no matter where you are in the
