Each LED collar has seven sets of colored lights. You can choose any one you like, or change a light color to match your pup’s outfit. Our collars are waterproof, but please stay away from sea-water. Rechargeable with any daily USB device! Full power can last 10 hours. Super strong 100% polyester webbing material with high-tensile stitching for maximum strength and safety for your dog. Easy to put on with a quick-release buckle, and adjustable to fit any size. Wear it as a regular collar during the day and light it up at night!