the Wilson Portable Ball Machine features:

    * New! Now includes smart charger
    * Ball capacity : 110 Balls
    * Trajectories : Groundstroke to Lob
    * Ball ejection speed : 10-70 MPH
    * Adjustable spin control for topspin or backspin
    * Ball feed rate : 1 1/2 to 10 seconds
    * Oscillator : Random
    * Automatic 10 second ball feed delay for start up
    * Playing Time: 3 to 4 hours typical
    * Recharge Time 12 hours, typical
    * Dimensions hopper closed : 20"H x 22"L x 14"W
    * Built in handle and towing wheels to enhance portability