Tennis Twist was designed especially for beginning tennis players. Its compact size and easy operation make it ideal for kids just starting tennis. If a child can swing a racquet, he or she can play with Tennis Twist. Tennis Twist is simple to use. Just turn it on and it shoots a ball every five seconds. The ball toss can be adjusted from 12 to 20 feet in length. The unique spiral design holds up to 28 balls. The Battery model will operate up to ten hours on six ‘D’ size alkaline batteries (not included). We recommend not using rechargeable batteries as the playing time is significantly less per charge. Tennis Twist’s adjustable range makes it practical for use in driveways, backyards, and even basements. And since it weighs just 11 lbs, it’s easily transported to the local tennis courts or park. The high-impact plastic case comes with a convenient built-in carrying handle. But don’t ask a kid about the convenience of Tennis Twist, they’ll just tell you how much fun it is.