Casio G-Shock GA-2100 Series Analog-Digital Watch GA2100-1A1

The Casio G-SHOCK GA-2100-1A1 pairs the brand's octagonal 2100-series profile with an all-black, monochrome analog-digital display. Its carbon-fiber-reinforced resin case uses the Carbon Core Guard structure to keep the watch slim and light while protecting the internal module from impact.

World time, a 1/100-second stopwatch, a 24-hour countdown timer, five daily alarms, and a hand-shift function make the low-profile design useful beyond basic timekeeping. Separate white LEDs illuminate the face and digital display.

• Exact model: GA-2100-1A1

• Monochrome black case, band, dial, and display treatment

• Carbon Core Guard shock-resistant structure

• 200 m / 20 bar water resistance

• Carbon and resin case with resin band

• Mineral glass

• Case size: 48.5 x 45.4 x 11.8 mm

• Weight: 51 g

• World time for 31 time zones

• 1/100-second stopwatch and 24-hour countdown timer

• Five daily alarms, hand shift, and double LED Super Illuminator

• Approximate three-year battery life on two SR726W cells

This is a water-resistant timepiece, not a dive computer. It does not measure depth or calculate decompression, ascent rate, or gas exposure. Follow Casio's instructions for water use and underwater button operation, and use dedicated dive instruments for scuba planning and monitoring.