automatic erratic rotation
A ball frequency: 25-95 times/minutes
The ball speed: 4-50 meters/SEC
A ball radian: height adjustable classification
A ball placement:
(1) the nod to full sets from 11 p.m. wrote program
(2) the arbitrary wrote short and long ball
Combination ball: built-in 30 sets of combination
ball program
A ball number: digital display mode
Voice prompt: various functions all audio
