Tennis Ball Training Device for Players

Function:

1.Speed:20-140 km/h

2.Frequency:1.8-6 sec/ball

3.Fixed point

4.Random function

5.Top and back spin adjustment

6.Deep-light ball

7.Standard accessories :remote control,power cable

8.Battery Optional:3-5 hours working time

9.Ball Capacity:160pcs

http://www.dkballmachine.com/