From G-Shock, the GA2100-1A1 Ana Digi Black Shock Resistant Watch features: Resin band Case / bezel material: carbon / resin Mineral glass Shock resistant Double LED light LED light for the face (super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) LED backlight for the digital display (super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) World time 31 time zones (48 cities + coordinated universal time), daylight saving on/off, home city/world time city swapping 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) Measuring modes: elapsed time, split time, 1st-2nd place times Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments, and 1-hour increments) 5 daily alarms Hourly time signal Hand shift feature Full auto-calendar (to the year 2099) 12/24-hour format Button operation tone on / off Regular timekeeping Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day) Digital: hour, minute, second, pm, month, date Accuracy: ±15 seconds per month Approx. battery life: 3 years on SR726W × 2 LED: white Case size approx. 48.5mm x 45.4mm x 11.8mm Water resistance: 200M Total weight approx. 51g Imported.