Blue -Tracer is not included Cat Airtag Collar, Reflective Cat Collar with Safety Closure, with Waterproof Airtag Holder, Suitable for Kittens and Small Dogs, Adjustable from 20-33cm. [Apple Air Tag design]: AirTag Cat Collars for Apple Air Tags are perfect for keeping you updated on your pet's whereabouts. Our collars come with an airline tag holder and a silver bell. (Note: Air tags are not included). [Pet Safety and Comfort]: The tag shell is made of soft, non-toxic and eco-friendly silicone and is printed with a beautiful reflective pattern that is highly visible in the dark. When pulled strongly, the button easily detaches, preventing choking accidents caused by pulling too hard on the pet's neck. [Adjustable collar size] : The length is adjustable to fit your pet's neck from 8.66 to 13.78 inches and the width is 0.4 inches, suitable for most small animals such as cats, dogs and kittens. To choose the correct size, please measure your cat's collar in a comfortable position before purchasing. [Large and easy to use]: The airbag collar for cats is equipped with a waterproof support for the airbag. Place the Apple airbag on the cat collar holder and then you can use your Apple phone to know exactly where your pet is and keep them safe. The sliding design can be used for cat collars, dog collars and anything with a harness.