If you need a tennis training machine under $800, this tennis machine S2021C is suitable for you, it's a level so you can use it to train your forehand and backhand. For most proficient people, you can adjust the feed rate to within 1.5 seconds to achieve a good movement effect. You can also practice hitting the ball, volleying, or even over your head or high by adjusting the height manually. This tennis shooting machine has no up and down rotation adjustment, and the feeding speed can reach 60 MPH. However, this speed is enough to satisfy most players below USTA 5.0. 1.The price is competitive and good outlook 2.Remote control,easy operation 3.The speed,frequency can be adjusted freely. 4.Function:Fixed point,topspin and backspin,light-deep ball,lob ball and random.Enough for kids ,beginner or primary level. …