1. Flexible, adjustable luminous dog collar: Suitable for dogs with a neck circumference of 12.9 to 16.9 inches (33 cm to 43 cm), featuring 7 beautifully designed 3D paws. The soft silicone material is used for adjustment to provide a more suitable fit. Before ordering, it is recommended to measure your dog's neck to ensure a proper fit. A wellfitting collar should allow you to place two fingers between the collar and your dog's neck. 2. 3D design, visibility, and safety: This LED luminous dog collar has a unique 3D flap design. It is super bright for nighttime walks, enhancing your dog's visibility and making it glow in the dark, reducing concerns about your dog's safety. 3. 4 lighting modes, easy to use: With a single click, you can switch between 4 different modes running light, slow flashing, fast flashing, and continuous light. The luminous collar is fully adjustable to fit almost any size, and the quickrelease buckle enables easy mode selection. 4. USB rechargeable and energysaving: The collar comes with a USB cable and can be charged with any USB device, eliminating the need for batteries. The charging time is approximately 2 hours, providing 6 10 hours of usage. It stays cool even during longterm use and is completely safe for your pets.