The 48.5-mm case of the Casio G-Shock GA-2100-1A1ER is made of a combination of synthetic resin and carbon. With a thickness of 11.8 mm and a weight of 51 g, this reference is thinner and lighter than the original from 1983. The heavy-duty material can withstand strong jolts and extreme temperatures.
The G-Shock pulls out all the stops to combine many useful functions in one watch. You can read the time in 31 time zones with the GA-2100-1A1ER, and switch daylight savings on and off. The watch also has a perpetual calendar (up to the year 2099) as well as a stopwatch function, timer, and five daily alarms. The stopwatch function can also display 1/100ths of a second, split times, and 1st and 2nd place times.
The actual time is shown via the analog display (two hands for the hours and minutes), while the LED screen shows the hours, minutes, seconds, 12-hour display, month, and date digitally. The hands and indices are luminous and glow in the dark. The digital display also has a backlight that can be turned on and off.
The unisex watch is equipped with a robust and scratch-resistant mineral crystal and offers water resistance to 200 m (20 bar, 656 ft), making it perfectly suitable for free diving. The battery life is approximately three years. Casio states that the deviation of the quartz movement is +/- 15 seconds per month.
Casio G-Shock GA-2100-1A1ER: Specs
- Dimensions: 48.5 x 45.4 x 11.8 mm
- Material: resin and carbon
- Strap: resin
- Dial: black
- Movement: quartz, battery-powered
- Water resistance: 200 m (20 bar, 656 ft)