Features: It is specially designed for Tracking GPS tracker, suitable for small animals like cats and dogs. Comes with an Tracking-compatible for case that is waterproof and shockproof. Designed for cats and small animals, retractable and out of reach of pets. The reflective collar features a snap-off safety buckle that can be easily released when pulled hard, making your pet safer when moving around the house. The length is adjustable to fit pet neck sizes from 22 to 34 for cm. 1 for cm width, fits most puppies and small pets. Reflective nylon kitten collar features a bell-shaped design to keep your pet visible in dark environments. Specifications: Material: Nylon+Silicone Collar Width: Approx.0.4in Min Length: Approx.8.7in Max Length: Approx.13.4in Color: Yellow, Green, Blue, Purple(optional) Package Includes: 1x for Cat Collar note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.