This is the indoor putting trainer that helps hone distance control on putts up to 45' long. Golfers putt balls along the 5'-long practice green to an electronic bumper that measures force, calculates the true distance of each putt, and displays the distance on its LED screen. The unit's integrated digital stimpmeter adjusts the putt distance readings to simulate slow (8.2), medium (9.8), or fast (11.5) greens, as selected by the user. The ball is automatically returned to the golfer, enabling hundreds of practice strokes during a 15-minute session to help develop muscle memory for any putt from 6' to 45' long. Guides on the putting mat help align putts, four game modes test your ability to hit perfect putts from predetermined distances, and the mat rolls up to make the entire unit the size of an alarm clock for easy storage and portability. Plugs into AC. 61" L x 8" W x 2" H. (1 1/2 lbs.)