Invented by Joe Mauer's father, the Quickswing PX4 uses a gravity-drop design to develop quick, compact swings, while increasing hand-eye coordination and reflexes. Adjust difficulty and height to suit any skill level. Feed manually with a partner or group, or autofeed up to 12 baseballs or 8 softballs in 6, 8, or 10 second intervals. Included rebounder allows players to hit off the bounce, making it easier for beginners. Assembly required. Requires 3 AA batteries (not included). 25 lb.