【for Apple Airtag Collar】The collar comes with an Airtag case, it is waterproof and shockproof. Insert an Airtag into this cat collar and mount to build a lightweight tracking collar for your cats. (Apple Airtag not included) 【Secure Collar】It features a breakaway safety buckle design, easy to release with a strong pull. The safety buckle quickly releases under pressure when your cat gets stuck on something, protect your pet 【Adjustable Collar】The length is adjustable, suitable for pet’s neck size from 22 to 35 cm, ideal for most kittens and small pets. Find the most comfortable size for you