... Pretty EleganceMicro-computer smart tennis ball machinel 1.The ball speed can be fully random adjusted, Ball direction built-in control ... , LCD display.l 3.11 functions with Remote control: ball speed, feed frequency ,work/pause, fixed point/flat stroke, horizontal/ ... power, AC110V-240V, DC12V available.l 5.Ball speed : 30-150 km/hr (remote control speed adjustment). Feed frequency:2-12second/ball, ...