The Franklin 90120X Pet Ready Set Fetch Automatic Tennis Ball Launcher for all dogs. Franklin 3 pack of tennis balls with built in squeakers is included as well as the original power cord. Has adjustable launch speed and pre-launch audible alert functionality. This unit is also capable of running on batteries. It has been tested and is fully functional. As noted in most reviews though the audible pre-launch alert isn't super loud. Ready for your favorite furry friend to enjoy hours of endless fun. Please check my feedback and purchase with confidence. Thank you for your interest.