The Tennis Cube by Sports Tutor is the most compact and simple tennis machine for beginner and intermediate players. It is so small and light just about anyone can lift it and it fits even in the smallest of car trunks. The Tennis Cube very simply does what a ball machine is supposed to do, throw tennis balls so you can practice your strokes. Just turn it on, set the ball speed, adjust the elevation if necessary and you are ready to start practicing!The oscillator adds a more game-like aspect to your training by automatically throwing balls in a sweeping pattern from side to side. A smart battery charger is included that recharges Tennis Cube continuously overnight without overcharging the battery.