1. Suitable for Airtag GPS tracker, suitable for small animals such as cats and dogs. 2. Waterproof and shockproof, retractable, out of reach of pets. 3. Reflective strip design, easier to be found at night 4. Adjustable collar size to fit most puppies and small pets 5. Material: Nylon 6. Note: The product is only a collar, not a tracker