Product descriptionMaterial: nylon fabric + iron bellSize: length 96cm, bell diameter 3.8cm, whistle 8 * 0.7cmColor: BlackPackage Contents: 1 * Bell Rope, 1 * Whistle, 1 * Clicker1.MADE TRAINING EASY - Dog training bells are one of the easy and non-confrontational solution to toilet train your puppy. Using dog bells have is proven to be an easier, fun and a win-win way for your dog communicate instead of barking, scratching or having to resort to more intrusive method.2.THREE LENGTH ADJUSTABLE - We upgraded this dog doorbell to 3 lengths as per customers feedback, the older version only with 2 lengths, the shortest length is still too long for handles that are lower. 3 snaps/buttons allow for longer range of length adjustment, so now you can turn it up shorter.3.PREMIUM QUALITY - The potty training door bell is made of heavy duty nylon material, prevents snags and withstands strong tugs. 7pcs 1.4 big extra loud stainless steel bells, shiny and jingle, perfect hanging door bells for potty training your pup.4.SOLID AND DURABLE - This dog bells and belt are custom made and tested thoroughly for durability. Belts are excellently sewed, durable and chew resistant; Bells adopt plating coating technology to keep it shine and dont rust; The connection of the bells and snap points are thick made from premium material.