Training with the Staneg tennis ball machine allows you to quickly improve your tennis level. Stabilization of your shots allows you to develop cardiologically and make successful strokes in a short time.
Internal Battery:
In the internal battery option, the battery is inside the machine. When you need to charge it, you have to carry the machine to the outlet. Recommended if you have a garage or will buy it for a tennis club. The battery is not lost and does not fall.
Extermal Battery:
In the external battery option, the battery is carried outside like a powerbank. You just carry the battery when you need to charge it. It is easy to use. Recommended if you live in an apartment.