Condition: Excellent Used Condition The Tempo Timer helps you practice & maintain tempo to your swing from start to finish. Tempo improves consistency in your swing when training for more speed. More speed equals more distance in your drives Yes, you can use an actual golf ball but there's no need to hit an actual golf ball—use a wiffle ball, Birdie Ball, sponge ball or equivalent to simulate a real ball. Immediate feedback provides a basis for golfers to determine swing improvements Range of speed measurement from 40 MPH to over 200 MPH. Speed drives more distance. For every 1 mph gain an average of 1-2 yards distance is gained Works with the Stack System, RypStick, SuperSpeed Stick & other popular swing trainers. Combine this with a trainer, clubs & irons to increase speed & get more yards Simple to use & easy to read using the same radar technology that defends our country w/the Patriot Missile Defense System & reliable for over 20 yrs