Watches don't come any more rugged than Casio's G-Shock models. Brutal testing ensures you of nearly indestructible performance. EL backlight with afterglow. Countdown timer with input range from one minute to 24 hours. Accuracy within 15 seconds per month. One-second auto-repeat function. 1/100th second stopwatch with elapsed time, split time, and first- and second-place time. Hourly time signal. Auto calendar. 12/24 hour formats. Water-resistant to 660 ft. Case diameter: 1.8". Colors: Black/Red, Black/Yellow.