Amazing patented speed sensing technology activates the Smart Ball Radar when it's thrown and computes its speed when it's caught.  Baseball radar registers speeds up to 105 mph in LCD window when caught.  Set it to pee-wee, youth league, or major league distances including 20, 30, 40, 50, 60.5, 70, and 80 feet. Not to be hit with a bat. Complete instructions and batteries included. Official size and weight.  With measuring string for accurate pitching distance.