This Ball Coach by Pocket Radar is designed to measure the fastest speed of a ball in flight for coaching and training purposes. Capture the pitch speed and hit speed in the same sequence with this discrete looking device. The 25 deep memory can measure between 25 - 130 mph and is accurate within ± 1 mph within a 120 foot range.There are two user-friendly modes: trigger and constant-on mode. For trigger mode, simply hold the button down well before the ball is in flight, and release once the speed is displayed. Easy trigger capabilities eliminate any timing requirements. Enter constant-on mode to provide automatic triggering without having to press the button.This radar works well for baseball, softball, tennis, volleyball, lacrosse, football, soccer and hockey.