

The Casio G-Shock GA-2100RC-1AER is a slim analog-digital G-Shock in an all-black carbon-and-resin case. At 11.9 mm thick and 52 g, it wears much flatter and lighter than the chunky 5000-series squares and many other G-Shocks, while keeping the full shock resistance and 200-meter water resistance. It packs world time across 38 time zones, a 1/100-second stopwatch, a 60-minute countdown timer and alarms. It suits people who want a tough everyday watch that slips under a cuff, and it is the pick over a basic DW-5600 if you want analog hands and a slimmer profile.
In stockShips from Hong Kong SAR China · priced in GBP (£71.54) · duties may applyReturn policy
Owners of the GA-2100 line praise its slim, light case and the octagonal look, and treat it as a tough daily watch. Common complaints are weak legibility in dim light and the lack of solar or Bluetooth.
The G-Shock GA-2100RC-1AER is an all-black digital and analog watch. It has a carbon and resin case and bezel and a resin band. The Carbon Core Guard structure makes it shock resistant, and it is water resistant to 200 meters.
Two hands show the hour and minute, and a digital display shows the hour, minute, second, pm, month, date and day. A hand shift feature moves the hands out of the way so the digital display is unobstructed. Double LED lights illuminate the face and the digital display in white.
It includes world time for 38 time zones, a 1/100-second stopwatch, a countdown timer, 5 daily alarms and an hourly time signal. The full auto-calendar runs to the year 2099. The watch runs on a rechargeable battery.