High Visibility-This LED dog collar with unique dog paw print design offers 500m of visibility to make your dog seen in the dark condition, keeping it safe at night. You will find your pet more easily, highly visible to car drivers, walkers, joggers, cyclists, motorists etc. 7 Light Modes-This light up dog collar has six light modes(red, blue, green, pink, light blue, yellow) and streamlined glow mode. You can choose the color you like, or even change a light color every day follow your mood. USB Rechargeable-This LED dog collar is powered by USB cable(included), which is convenient and environmentally friendly. The lighted dog collar runs up to 6-10 hours on a full charge. It will not give out heat for long time use. Durable & Waterproof-This adjustable lighted dog collar is made of nylon and PU material,which is robust and durable. In addition,the waterproof design allows your dog to walk on light rainy day. Please do not soak it in deep water or wash the dog collar for a long time. 4 Size Options-The size of the collar can be adjusted freely and available in 4 different sizes(Extra Small Size: 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 the dog's neck with a soft tape measure to choose the right size. Please contact us if any problem about the item and our service, we will try our best to resolve the problem.