Mad Wave’s STOPWATCH 500 is a professional-quality stopwatch. Measures in 1/1000 sec increments. 500 lap memory. Displays numbers of laps, time of each lap and general distance time. Calculates and displays the fastest, slowest and average lap time. Includes calendar, watch, alarm. Memory recall during stopwatch mode. CR2430 lithium battery. Water resistance – 3 bar. Do not use underwater.