Features:LED lights up on the back of your dog in various colors at night， you can see him at long distances， also works well to alert drivers and other walkers， makes walking at night much more safer due to visibility of the lights.LED costume makes your puppy dog unique and different.Come with batteries， Pls do not wash by machine.Intended For:Dogs / Gender: for both Girls and BoysCleaning Instructions: This Dog Custume is suggested to be washed by hand.5 Sizes: XS， S， M， L， XL，Please compare the size of your puppy with the size chart before you buy.