[Product Description] 
1: Nets in front of the fixed ball, backfield fixed ball, front and back ball.
2: Two-line ball in front of the net, two-line ball in the backfield.
3: Swing the ball horizontally in the backfield.
4: Left cross ball, left cross ball, quartet ball, random ball.
5: Work/pause.
6: Speed is adjustable.
7: The frequency is adjustable.