Hasbro Nerf Firevision Football Unique Ultra Bright Microprism Technology Nerf Firevision Football Unique Ultra Bright Microprism Technology Includes firevision frames to activate ball The ball's unique microprism Technology lets you play for hours with blazing energy and a bright glow with no charging Whether you're slamming through a hardcore game or scrimmaging with a friend, you'll be at the top of your game with the firevision sports football and activation frames The firevision sports football glows with ultra-bright light, day or night