Unique Automatic Continuous Launch Function Our latest upgraded automatic continuous launch function (up to 3 balls can be placed at once) increases the fun and challenge of playing. Most other ball launchers can only launch one ball at a time. Four Launch Range Modes There are four range modes of automatic ball launcher, you can choose near, medium, far or random distance to meet the different needs of indoor or outdoor play. Special Small Sized Balls This launcher is a small machine that uses a special size ball with a diameter of 2 inches, instead of a standard size tennis ball of 2.5 inches. This launcher is suitable for small to medium dogs to play with, not for large dogs to play with. Power Cord and Battery Option Our ball launcher provides a power cord for continuous indoor play, or you can use 8 Type C batteries (not included) for outdoor play.