The Robic SC-848W 300 Dual Memory Speed and Chrono stopwatch is perfect for all types of sports timing. EL backlight that illuminates the entire display. 300 dual split memory recall. Selectable beep confirmation or silent operation. 1/100 second precision to 100 hours. User selectable running lap or split time. Speed timer in MPH/KPH. Automatic lap counter to 999. Stroke rate calculator displays strokes per minute. 300 memory recall of lap speed, time and number. Includes breakaway safety lanyard. Water resistant to 30 meters. Lithium CR-2032 battery with an average five year battery life.