CASIO G-SHOCK GM-S2100B-8AER Black. Case size (L×W×H): 45.9×40.4×11mm. Case/Bezel Material: Resin/Stainless Steel. Resin bracelet. Impact resistance. approximate battery life: 3 years on CR1025. Water resistance to 200 meters. Mineral glass. World time, 31 time zones (48 cities + Coordinated Universal Time), city code display, city name display, daylight saving time on/off, automatic daylight saving time. 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) Measurement modes: Elapsed time, split time. Countdown timer measurement unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments ). 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). LEDs: white. 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 the contents of the digital display.). Standard timekeeping: Analog: 2 hands (hour, minute (hand moves every 20 seconds)) Digital: Hour, minute, second, 12-hour format, month, date, day.