Features 
 
G-SHOCK has continuously developed new and unique designs while pushing the limits of timekeeping robustness ever since the first DW-5000C went on sale back in 1983. These brand-new models represent these initiatives in a svelte design.
These new models carry over the octagon shape used for the first DW-5000C. Without sacrificing G-SHOCK level robustness, analog-digital timekeeping is housed in a no-frills straightforward design.
The thinnest G-SHOCK combo model casing measures just 11.8 mm and is made possible by high-strength resin material that is strengthened with carbon fibres.
Neobrite: Only for GA-2100-1A, GA-2100-4A 
 
Specifications
 
Case / bezel material: Carbon / Resin　
Resin Band
Mineral Glass
Shock Resistant
Carbon Core Guard structure
200-meter water resistance
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
1/100-second stopwatch
Measuring capacity:
00'00''00~59'59''99 (for the first 60 minutes)
1:00'00''~23:59'59'' (after 60 minutes)
Measuring unit:
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 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
Size of case : 48.5×45.4×11.8mm
Total weight : 51g