The Spyder Grypz Saturn ball is a durable, battery-powered lacrosse ball crafted so that you and your friends can throw a ball around at night even after the sun has set. Similar size and dimensions as a normal lacrosse ball, just slightly lighter. Always play safely and stay aware of your surroundings. The night is young! Colors rotate during use. Battery included. Battery activation manual included. After initial battery activation, simply bounce your Saturn Ball on the ground to activate it. Great stocking stuffer during the holidays. Keep away from dogs and children due to a battery/small part chocking hazard.