Description Highly recommendable for tennis kids, beginners, tennis academies, coaches with many players, tennis courts with no backboard, and tennis lovers. The size after installation : 3.3 ft x 3.3 ft x 6.6 ft Box shipping weight : 66 lb Easily movable with rear wheels No moving parts and no power Aluminium base metal and stainless steel rivets used Ball speed and bounce can be adjusted on the rebounder mode by changing position of rubber band on the tude. (Please refer to the picture above.) Precautions Secure the machine to the wall or floor to prevent it from falling over by unpredictable strong wind. Some balls may get stuck in the exit tubes such as Wilson US Open balls and Dunlop Fort Balls due to somewhat bigger diameter. But, most of tennis balls work very well. Features & details Enjoy two playing modes - Two Exits Mode and Rebounder Mode Two Exits Mode : Ball drops through one of two exits before hitting the bouncer. Rebounder Mode : Ball slides down and pops up at the lower bar before hitting the ground. Bouncer is not needed on rebounder mode. Ball speed and bounce can be adjusted on the rebounder mode by changing position of rubber band on the tude. Please search "The Tennis Partner 3" on Youtube and see how it works.