Press start, throw the ball, and the LCD indicator displays pitch speed in MPH upon impact. 3 predetermined distance settings of 40 ft., 43 ft., and 46 ft. Official size and weight of a regulation softball, but used as a training aid for any age or skill level. Measure distance between pitcher and catcher with included measuring string and choose one of the predetermined distances into Speed Sensor. GripSense technology begins to record the speed automatically the moment the ball is released. Conversion chart for throwing at 35 ft. For pitching throwing training only, not to be hit with a bat or on hard surfaces. Baseball version has Little League distances and High School/College/Pro distances preset. Just pick the distance and throw it!