Product DescriptionMaterial: Nylon Fabric + Iron Bell Dimensions: Length 96cm, Bell Diameter 3.8cm, Whistle 8*0.7cm Color: Black Package Contents: 1*Bell Rope, 1*Whistle, 1*Clicker1.MADE TRAINING EASY - Dog Training Bell is one of the simple and non-confrontational solutions for potty training your puppy. Using a dog bell has proven to be an easier, fun and win-win way for your dog to communicate, rather than barking, scratching or having to resort to more invasive methods. 2. THREE LENGTHS ADJUSTABLE - We upgraded this dog doorbell to 3 lengths According to customer feedback, the old version only had 2 lengths, the shortest length is still too long for the lower handle. 3 snaps/buttons for longer length adjustment, so now you can make it shorter. 3. PREMIUM QUALITY - The potty training doorbell is made of heavy duty nylon material to prevent obstacles and withstand powerful tugs. 7 1.4 large super loud stainless steel bells with sparkling jingles, perfect hanging doorbells for training your puppy. 4. Durable - This dog bell and belt is custom made and thoroughly tested for durability. The belt is well sewn, Durable; chewable; The bell adopts electroplating coating technology to keep the luster and rust free; The connection of the bell and the snap point is made of high quality material. 5. Worry-Free Purchase - If you dont want to install a dog door on your house door, the package includes a dog doorbell and a reward dog training clicker, this puppy bell is a good choice.