Puttist-Digital Putting Trainer (Silver) Digital sensor technology measures putting distance & accuracy Green speed adjustable to Slow, Average or Fast Guides on the Putting Green mat help you monitor your stroke Four skill games make training fun while helping you measure improvement Practice 6- to 45-foot putts to develop your touch in a 5-foot space. The unit and mat fit in your computer bag, golf bag or luggage. Play and practice at home, in the office, on the road!