super smooth full-size 3-inch tracking ball. 
Easy to set up. if you use this one for name, just press the tab buttons, and select " config this game: then you can use this tracking ball to play golf games or other rotary direction control games. 
We have the I/o version too, which works on 60 in 1 or 512 or 412 game board. 
So if you require i/o board please let me know after the auction.