The Casio G-SHOCK GA-2100 Series, popularly known as the "CasiOak", combines the iconic octagonal bezel inspired by the original DW-5000C with a slim, lightweight Carbon Core Guard construction. Designed for everyday wear, sports, and outdoor adventures, the GA-2100 offers legendary G-SHOCK durability in a modern analog-digital format.

The series features Shock Resistance, 200-meter water resistance, World Time, Double LED Super Illuminator, 1/100-second stopwatch, countdown timer, 5 daily alarms, and a hand shift function that moves the analog hands away from the digital display when needed.

All five variants share the same specifications and differ only in color and materials. The newer Tone-on-Tone models (2A2, 7A7, and 9A9) use bio-based resin for the bezel and band, while retaining the same Carbon Core Guard construction.

Design

• Analog-Digital Display
• Octagonal Bezel Design
• Carbon Core Guard Structure
• Carbon Fiber-Reinforced Resin Case
• Resin / Bio-Based Resin Bezel
• Resin / Bio-Based Resin Band
• Mineral Glass
• Double LED Super Illuminator
• Slim Lightweight Construction
• Modern Minimalist Dial

The GA-2100's slim 11.8 mm profile and octagonal bezel have made it one of G-SHOCK's most recognizable designs. The monochromatic Tone-on-Tone editions feature subtly different shades across the bezel, dial, and band for a refined appearance.

Key Features

• Shock Resistant
• Carbon Core Guard Structure
• 200M Water Resistance
• Analog-Digital Display
• World Time (31 Time Zones / 48 Cities)
• Double LED Super Illuminator
• Hand Shift Function
• 1/100-Second Stopwatch
• Countdown Timer
• 5 Daily Alarms
• Hourly Time Signal
• Full Auto Calendar (To 2099)
• Button Operation Tone On/Off
• 12/24-Hour Format
• Mineral Glass
• Lightweight Construction
• Approximately 3-Year Battery Life

Specifications

• Brand: Casio
• Collection: G-SHOCK
• Series: GA-2100
• Models: GA-2100-1ADR / GA-2100-2A2 / GA-2100-4A / GA-2100-9A9DR / GA-2100-7A7DR
• Gender: Unisex
• Movement: Quartz
• Display: Analog-Digital
• Case Material: Carbon Fiber-Reinforced Resin
• Bezel Material: Resin / Bio-Based Resin*
• Band Material: Resin / Bio-Based Resin*
• Glass: Mineral Glass
• Construction: Carbon Core Guard
• Shock Resistant: Yes
• Water Resistance: 200 Meters / 20 BAR
• Case Size: 48.5 × 45.4 × 11.8 mm
• Weight: 51 g
• Accuracy: ±15 Seconds per Month
• Battery: SR726W × 2
• Battery Life: Approximately 3 Years

Timekeeping Functions

• World Time
• 31 Time Zones
• 48 Cities + UTC
• Daylight Saving On/Off
• Hand Shift Function

Stopwatch

• Resolution: 1/100 Second
• Measuring Capacity:
  • 00:00'00"–59:59'99"
  • 1:00'00"–23:59'59"
• Modes:
  • Elapsed Time
  • Split Time
  • 1st–2nd Place Times

Countdown Timer

• Measuring Unit: 1 Second
• Countdown Range: 24 Hours

Alarm

• 5 Daily Alarms
• Hourly Time Signal

Light

• Double LED Super Illuminator
• LED for Analog Face
• LED for Digital Display
• White LED
• Afterglow

In the Box

• Casio G-SHOCK GA-2100 Watch
• Original G-SHOCK Box
• Instruction Manual
• Warranty Card

Warranty

2 Years International Warranty (Subject to Casio warranty terms.)