Perfect for baseball, softball, soccer, football and lacrosse For the most accurate results, position the user between 35 and 50 feet from the unit. The further the user is outside this area, the greater the chance of inconsistent readings. It is recommended to use balls with leather covers for the most accurate readings. Balls with synthetic covers may give less accurate readings. Displays in mph or km/h For the best results, place the Sport Radar on the ground and align as closely to the ball path as possible when using for baseball, softball and soccer. For lacrosse and football, place the Sport Radar on a stool, bucket or other pedestal to raise the ?strike zone? to your desired height.