COMPATIBLE WITH APPLE AIRTAG: Our cat collar is specially designed for Apple Airtag GPS tracker, not for other devices. Comes with a waterproof and shockproof Airtag case. EASY TO USE: Put the Airtag GPS tracker into the cat collar holder, then you can use your iPhone to track your pet. The slip-on design can be widely used for cat collars, dog collars and anything with a shoulder strap. Bell and Reflective: The Airtag cat collar features a clear bell and noisy that lets you know where your cat is in real time. The reflective design keeps your pets visible in dark environments. Safety release buckle: It adopts a removable safety buckle design, which can be released by pulling it hard, and it is easy to open and close, so that your pet can be easily released when trapped, and it is safer to run inside. . Adjustable Collar Size: Adjustable length to fit pet neck sizes from 8.66 to 13.78 inches. 0.4 inches wide to fit most cats, puppies and small pets. Please measure your cat's neck size before purchasing.