Features:1. Alarm Assistance: When the dog's owner is not careful, he goes out to warn the dog to avoid getting lost.2. Applicable: Whether it's handlebars, picking doors and so on, it can be used as long as there are handlebars.3. Widened nylon: high quality widened nylon, durable and bite-, long-term use.4. Six bells: Six alarm bells, loud but not harsh, within 20 meters indoor voice is clear and audible.5. At the same time, it assists the dog to open the door and the dog from scching the door board.Description:This product is specially made for dogs and has many functions, such as how to train them to go to the toilet and how to them from scching the door.Specifications:Color: blackMaterial: Nylon and Iron BellSize: 25*850mmType: pet supplyPackage Included:1* pet doorbell/ 2* pet doorbells (optional)Notes:1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibed same, item color displayed in photos may be showing slightly different from real object.