The Casio G-Shock GA-2100-9A9ER is the slim 'CasiOak' analog-digital watch in a tone-on-tone yellow finish. Its Carbon Core Guard case measures 48.5 × 45.4 × 11.8 mm and weighs 51 g, with 200-meter water resistance, world time across 31 time zones, a 1/100-second stopwatch and a 3-year battery. It suits people who want G-Shock toughness in a thinner, lighter case and don't mind a loud color. Against the classic square G-Shocks it is slimmer and more wearable; against steel analog watches it trades metal and sapphire for resin and mineral glass. Owners rate it highly, though the all-yellow look and the small analog hands draw the most comment.
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Owners rate it 4.7 out of 5 and praise the slim, light case and the tough G-Shock build. The bold yellow finish and the legibility of the small analog hands are the main points of debate.
The Casio G-Shock GA-2100-9A9ER is an analog-digital watch in a tone-on-tone yellow design. The case and bezel are made of carbon and bio-based resin, and the band is bio-based resin. It has a Carbon Core Guard structure and is shock resistant. The glass is mineral glass.
Water resistance is 200 meters. Two LED lights, one for the face and one for the digital display, use a Super Illuminator with a white light. You can select an illumination duration of 1.5 or 3 seconds, and both lights have afterglow.
Timekeeping is analog with two hands for hour and minute, a day dial and a digital display for hour, minute, second, pm, month and date. The watch has world time, a stopwatch, a countdown timer, five daily alarms and an hourly time signal.
