Reflective, flashing collar is great for dogs or cats. Collar is made with a reflective strip that makes it easier to see your pets in the dark. Also includes 2 built-in, red, flashing LEDs for extra safety. On/off button for flashig light mode. Requires 1 CR2032 Battery (included). Reflective strip is yellow and 3/4 inch thick. Includes 1 D ring for Id's or leashes and a sturdy, secure plastic buckle. Large size pet collar adjusts to fit sizes 16-22 inches. Sold each. Can also be used as a reflective band for runners, bikers, children, etc.. Can be fastened around arms, waist, etc..