BALL TOSS - Adjustable from 12 to 20 feet. BALL FEED INTERVAL - Throws a ball every five seconds. VERSATILE - Throws regular and oversize TENNIS BALLS and PICKLEBALLS. BALL CAPACITY - 28 balls. BATTERY POWERED - Typically operates eight to ten hours on six new ‘D’ size alkaline batteries (not included). NOT JUST FOR TENNIS - It can also be used to toss batting practice for beginning BASEBALL players (using tennis balls). Tennis balls are safer for kids, and won’t break windows like baseballs. Dogs love it too! THREE YEAR WARRANTY - Check this against no warranty for many offshore brands. We can offer this long warranty because we are MADE IN THE U.S.A. SERVICE - We are here for you at our factory in Burbank, CA. If you need advice, parts, accessories or service just call us toll free from the U.S.A. EASY TO TRANSPORT - Weights just 10 lbs. and has built-in carrying handle. SEE CHART BELOW for more Sports Tutor tennis machines. Tennis Twist was designed especially for beginning players.