Casio G-Shock GA-2100-1A1ER

Casio G-Shock GA-2100-1A1ER – Carbon Core Strength in a Slim, All-Black Design

The GA-2100-1A1ER from Casio is one of the most popular models in the G-Shock lineup. Known for its octagonal bezel, ultra-slim profile, and stealth matte-black finish, this watch blends urban style with legendary durability.

Engineered with Carbon Core Guard construction, it delivers exceptional shock resistance while remaining lightweight and comfortable on the wrist. Whether you're training, traveling, or wearing it daily, this model is built to perform.

Technical Specifications

• Dimensions: 48.5 × 45.4 × 11.8 mm
• Weight: 51 g
• Material: Carbon fiber reinforced resin case with resin band
• Water Resistance: 200 meters (20 ATM)
• Module: 5611
• Battery Life: Approx. 3 years (2 × SR726W batteries)
• Accuracy: ±15 seconds per month
• Packaging: Comes with original box

Core Features

• Shock resistant structure
• Dual LED light (Super Illuminator)
• World time – 31 time zones (48 cities + UTC), daylight saving on/off
• Hand shift feature for clear digital display view
• Full auto-calendar (programmed until year 2099)

Advanced Functions

World Time

• 31 time zones (48 cities + coordinated universal time)
• Daylight saving time on/off

Stopwatch

• 1/100-second stopwatch
• Measuring capacity:
• 00'00''00–59'59''99 (first 60 minutes)
• 1:00'00–23:59'59 (after 60 minutes)
• Measuring unit:
• 1/100 second (first 60 minutes)
• 1 second (after 60 minutes)
• Modes: Elapsed time, split time, 1st–2nd place times

Countdown Timer

• Measuring unit: 1 second
• Countdown range: 24 hours
• Start time setting range: 1 second to 24 hours
  (1-second, 1-minute, and 1-hour increments)

Alarm / Hourly Signal

• 5 daily alarms
• Hourly time signal

Why Buy the GA-2100-1A1ER?

• Slim and lightweight G-Shock design
• Durable carbon-reinforced structure
• Professional-grade 200M water resistance
• Ideal for sports, outdoor activities, and everyday wear
• Original box included

The Casio GA-2100-1A1ER is a modern essential for anyone who wants toughness, precision, and minimalist design in one powerful timepiece.