From the G Shock Collection. Ever since the first DW-5000C went on sale back in 1983, G-SHOCK has continued to push the limits of timekeeping toughness while creating new and original designs. These new models embody these efforts in an attractively thin configuration, and inherit the octagon form that was also employed for the original DW-5000C. Analog-digital timekeeping comes packed into a no-nonsense simple design without sacrificing G-SHOCK level toughness. High-strength resin material, which is reinforced with carbon fibres, makes it possible to create a case that is a mere 11.8 mm thin, which is the thinnest among G-SHOCK combination models.

Carbon Core Guard Structure: A new carbon core guard structure protects the module by enclosing it in a carbon case. The case is made of fine resin embedded with carbon fibers for outstanding strength and crack resistance.
Quartz movement
Textured bezel
Mineral crystal
Black dial
Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day)
?Digital: Hour, minute, second, pm, month, date
Peg and buckle closure
Casio one-year limited warranty
Imported

FEATURES
Model number: GA2100-1A1
Water-resistant to 20 ATM
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 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
Neobrite: Only for GA-2100-1A, GA-2100-4A

SIZE
Octagon case, 51.2mm (2")
Resin strap, 16.9mm (0.7")