High Visibility- This LED dog collar is designed with a unique dog paw print, providing 500 meters of visibility, allowing your dog to see in dark conditions, ensuring safety at night. You'll find your pets easier, it's very visible to car drivers, walkers, joggers, cyclists, motorists, and more. 7 Light Modes- This light up dog collar has six light modes (red, blue, green, pink, light blue, yellow) and streamlined light modes. You can choose your favorite color and even switch to a lighter color every day depending on your mood. DURABLE & WATERPROOF- This adjustable light up dog collar is made of nylon and PU material, sturdy and durable. In addition, the waterproof design allows your dog to walk in light rain. Do not soak it in deep water or wash the dog collar for a long time. USB Rechargeable- This LED dog collar is powered by a USB cable (included), which is convenient and environmentally friendly. The light up dog collar can run for up to 6-10 hours when fully charged. It will not heat up after long-term use. 4 SIZE OPTIONS- The collar size can be adjusted freely, 4 different sizes are available (Extra Small: 7.87" - 11.8" / Small: 11.8" - 15.7" / Medium: 15.7" - 19.7" / Large: 19.7" - 23.6"). Note: Please measure the circumference of your dog's neck with a soft measuring tape to choose the right size. If there is any problem with the item and our service, please contact us, we will try our best to solve the problem.