WauDog Cat Collar Endless Worlds Plastic Fastex 10mm x 20-30cm with SmartID. Designed with a monster pattern, this collar is extremely durable and easy to clean and dry. It features a plastic safety buckle and adjustable length, offering comfort to your kitten without weighing it down. The included QR Code takes you to a special app for registering your cat’s profile, ensuring that if it gets lost, app users are notified.