CASIO G-SHOCK G-Shock GA-2100-1AER. Case size (L×W×H): 48.5×45.4×11.8mm. Case/Bezel Material: Carbon/Resin. Impact resistance Carbon Core Guard structure. Resin bracelet. Water resistance to 200 meters. Approximate battery life: 3 years on SR726W x 2. Mineral glass. World time, 31 time zones (48 cities + Coordinated Universal Time), daylight saving time on/off. 1/100th second stopwatch Measuring capacity: 00'00''00~59'59''99 (during the first 60 minutes) 1:00'00~23:59'59 (after 60 minutes) Unit of measurement : 1/100th of a second (during the first 60 minutes) 1 second (after 60 minutes) Measuring modes: Elapsed time, split time, 1st and 2nd place times. Countdown timer measurement unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 second to 24 hours (1 second, 1 minute and 1 hour). 5 daily alarms Hour signal. Dual LED illumination Dial LED illumination (Super Illuminator, selectable illumination duration (1.5 or 3 seconds), afterglow) LED backlight for digital display (Super Illuminator, selectable illumination duration (1.5 or 3 seconds), afterglow). Complete automatic calendar (until the year 2099). Activation/Deactivation of the button tone. Accuracy: ±15 seconds per month. 12/24 hour format Hiding hands function (to provide an unobstructed view of digital display content.) Standard timekeeping: Analog: 2 hands (hour, minute (hand movement every 20 seconds)), 1 dial (day) Digital: Hour, minute, second, 12-hour format, month, date.