Design for Fun: All For Paws Interactive Ball Launcher is an automatic fetching machine that can be used by dog and owner or just the dog. The launcher features make independent play easy and fun, all you have to do is plug it in, choose your launching distance and then drop in a 2.5'' max ball.Launch Distance Adjustable: The ball launcher can launch the ball 10, 25 or 40 feet, which can easily be changed with the push of a button.Fetch Balls Includes: This ball throwing toy comes with three tough tennis balls for endless fun. Works with 6 pcs C batteries ( not included ), or with AC adapter (included).ADVICE OF USE: Always supervise your dog while playing. Some toys may be inappropriate for your dog. Remove and replace the toy if it becomes damaged.