Features: Durable material: The Dog Training Bells and belt have been tested for ruggedness. It can withstand the pull and bite of large-sized dogs. For training: Dog bells for potty training can be the perfect way to toilet train your lovely pet. Instead of barking and scratching your furniture, the attention of your dogs can be turned to the bell and belt. Adjustable length: For dogs of all sizes, you can adjust the rope length according to the height of dogs and doorknobs within a range of 31-33inch. GPS your dog: The 7 bells can help you acquire the position of your dog wherever you are at home. You can hear the ringing sound even 25m away. Ideal gift: It’s an ideal gift for those pet keepers. Any problems, feel free to contact us. Honor to serve you! Specifications: Name: adjustable dog bells rope Material: nylon+metal Color: black Adjustable length range: 31-33inch Package information: Size: 13133cm Weight: 95g Package list: 1*doorbell rope