Features: 1.The polypropylene strap is very durable in use and it has a better property of withstanding bite. 2.6 alarm bells make louder sounds but not harsh, you will hear it clearer. 3.An easier and better way for your dog to communicate, instead of hearing barking or scratching, you hear gentle jingle of bells. 4.The length of strap can be adjusted to fit for small, medium and large dogs. 5.It is easy to use, snap button design, you can hang it at any doorknob or handle. 6.The dog's hanging bell can be hung on the door as a door decoration, which can save a lot of headaches and a lot of time and troubles. Specification: Condition: Item Type: Pet Doorbells Material: Polypropylene Ribbon Color: Black Strap Size: Approx.95x2.5x0.2cm/37.4x1x0.1in Bell Size: Approx.4x4x4cm/1.6x1.6x1.6in For Pets: Cats,dogs Function: Hang them on doorknobs or other places for pets to play. Weight: Approx.97g/3.4oz PackageList: 1 x Pet Doorbell Belt with 6 Bells Note： 1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.