This is for Basic Model Spinshot Lite Tennis Training Machine---For Junior Player only. Most portable ball machine in the world. Max speed 50kph. Ball capacity:40-50. Be located at middle of court near service line, and it will shoot balls from service line to opposite service line with adjustable ball height, speed control and feed interval. For high speed and advanced models, please refer to Spinshot Pro, Plus or Player. More details can be found at Spinshotsports website, or from Youtube videos. Any questions please contact with Spinshot sports directly.