Mud-Resistant 100m water-resistance Dual time Countdown timer Vibration alarm Full auto-calendar 1/100 second stopwatch 10 year battery life LED backlight (super illuminator) with afterglow This watch boasts a heavy-duty design with mud-resistance. It is water-resistant to 100 meters. Also featuring dual time, countdown timer, vibration alarm, full auto-calendar, 1/100 second stopwatch, 10 year battery life, and an LED backlight (super illuminator) with afterglow.