Such a bright idea! Kids of all ability levels will love to catch, throw and kick these lighted balls, night or day, in the yard, park, beach or pool. Impact activates the lights, which get brighter as the action ramps up. The NightBalls are durable, waterproof and they float, putting sports fun in a whole new light. 2 AA batteries included. From Tangle Inc for ages 3-12 yrs.