There are many various types of ball machines that you can invest in. Probably the ones that make the most sense are the portable models that you can place in your car easily and take to the public tennis courts. You’ll want to make sure it’s light weight, easy to carry and runs on rechargable batteries.
A ball machine can be very useful for a player who is serious about becoming a better player. If you want to work on one particular shot like a forehand, backhand or volley, you can set the ball machine to hit you ground strokes or short balls or a variation of both.