Flexible, adjustable luminous dog collar - Size and fit: suitable for dogs with neck circumference 12.9 to 16.9 inches (33 cm to 43 cm). The soft silicone adjustable strap provides a comfortable, tailored fit. The collar features 7 paw prints in a 3D design for a distinctive look. Before ordering, measure your dog's neck to ensure a perfect fit. A well-fitting collar should allow two fingers between collar and neck. - Visibility and safety: LED luminous collar with a unique 3D flap design. Super bright for night dog walks and outdoor activities, keeping your dog highly visible and glowing in the dark. - Modes and ease of use: four lighting modes accessible with one button, including running light, slow flashing, fast flashing, and continuous light. The collar is fully adjustable, and the quick release buckle makes it easy to switch modes and put on or take off. - Battery and charging: USB rechargeable with the included USB cable. Charging time is about 2 hours. Runtime is 6-10 hours, with no heat buildup during extended use. Safe for pets. Practical use scenarios - Nighttime city walks or park runs: the bright LED and continuous glow enhance visibility to pedestrians and drivers, increasing safety in low light. - Training and recall practice in dim light: easy mode switching helps you signal your dog clearly during exercises without shouting or additional equipment. - Outdoor activities at dawn or dusk: suitable for hiking, camping, or late-afternoon adventures when visibility is reduced. This collar combines a soft, comfortable material with a high-visibility, easy-to-use design, making night-time activities safer and more enjoyable for you and your dog.