Casio GA2100GB1AER Slim Black & Gold Tough Watch

The Casio G-Shock GA2100GB-1AER is a slim, rugged watch with a black resin case and strap accented by gold-tone details. It features shock resistance, 200-meter water resistance, and LED illumination for excellent durability and visibility. Functions include world time, stopwatch, countdown timer, 5 alarms, and a hand-shift feature for easy digital reading. With a long-lasting battery and bold design, it combines G-Shock toughness with modern style for everyday wear.

Basic Information
Case size : 48.5 × 45.4 × 11.8 mm
Weight : 51 g
Case and bezel material : Carbon / Resin　
Band : Resin Band
Construction : Shock Resistant, Carbon Core Guard structure
Water resistance : 200-metre water resistance
Power supply and battery life : Approx. battery life: 3 years on SR726W X 2

Exterior
Glass : Mineral Glass
Compatible band size : 145 to 215 mm
Other : Neobrite

Watch Features
World Time : 31 time zones (48 cities + UTC), DST on/off
Stopwatch : 1/100-second, measures elapsed, split, and 1st-2nd place times
Countdown Timer : Up to 24 hours, adjustable in seconds, minutes, or hours
Alarms : 5 daily alarms + hourly time signal
Light : Double LED (face & digital) with Super Illuminator, adjustable duration, afterglow
Calendar : Full auto-calendar until 2099
Accuracy : ±15 seconds per month
Other Features : 12/24-hour format, hand shift for unobstructed digital view, analog and digital time display, button mute option