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Casio G-Shock Octagon GA-2100SU-1AER Watch

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Casio G-Shock Octagon GA-2100SU-1AER Watch

Waterproof and shock-resistant sports watch featuring quartz movement. Comes with LED backlight and Dual Illuminator function. The hands are coated in a fluorescent Neobrite layer, enabling time visibility in the dark. The analog-digital dial is shielded by mineral glass with a Mohs hardness level of 5.

Robust construction

Utilizing the G-Shock system and a carbon-reinforced case enhances durability against impacts and physical damage. The dial is protected by mineral glass with a Mohs hardness level of 5.

Offering high water resistance, the model can withstand submersion up to 200 meters (20 bar), making it suitable for swimming and even diving.

Dial, Dual Illuminator, Neobrite

The analog-digital dial, measuring 33 mm in diameter, shows time in a 12/24-hour format and comes with an LED backlight featuring a Dual Illuminator capability. Hands with fluorescent Neobrite coating guarantee visibility in dim conditions or complete darkness.

Flexible strap

Experience comfort with a black-colored elastic strap secured by a metal buckle. The material is resistant to moisture and sweat, making it perfect for a variety of activities.

5 alarms, calendar, stopwatch, timer, world time function, average speed measurement

The watch is outfitted with:

  • 5 daily alarms featuring a snooze function
  • an extended perpetual calendar
  • a stopwatch capable of up to 24-hour measurement with 1/100-second accuracy
  • a 24-hour countdown timer
  • a world time function to check the time across different time zones
  • the ability to measure average speed on a traveled route

Battery-powered

The device runs on two SR726W batteries, with an estimated lifespan of 3 years according to the manufacturer.

Main features

  • G-Shock system
  • Water resistance up to 200 meters
  • Robust design
  • Dual Illuminator lighting feature
  • Hands feature Neobrite fluorescence
  • Quartz movement
  • Calendar
  • Stopwatch
  • Timer
  • World time capability
  • 5 alarms
Casio


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Casio is a Japanese brand founded in 1946, known worldwide as one of the leaders in consumer electronics. A breakthrough moment in the company's history was the launch of the G-Shock series in the 1980s, which gained cult status thanks to its exceptional resistance to shocks, water, and extreme environmental conditions. Casio is constantly developing its technologies, introducing features such as Tough Solar - a solar power system - and Wave Ceptor - time synchronization using radio waves, which ensures precision and reliability. The brand's watches are popular among both professionals and users looking for durable solutions for everyday use and outdoor activities. The first G-Shock model – DW-5000C, designed by engineer Kikuo Ibe in 1983, passed a drop test from the tenth floor and continued to function flawlessly, which became the foundation of the series' legend. Today, Casio is synonymous with innovation, reliability, and timeless design.

More Information
Gender Men's
Smartwatch No
Body material carbon fiber
Type of mechanism Quartz
Watch power supply Battery SR726W X 2
Strap Plastic
Glass Mineral
Alarm Yes
Date stamp Yes
Stopwatch Yes
Backlight Yes
Waterproof 20 ATM / 200 m
Shockproof Yes
NFC No
Calendar Yes
Compass No
GPS No
Barometer No
Thermometer No
Altimeter No
Chronograph No
Pedometer No
Calorie counter No
Heart rate measurement No
Pulse oximeter No
Weight 51 g
EAN 4549526259036
Manufacturer code GA-2100SU-1AER
Brand Casio
Neobrite feature
Neobrite
Neobrite is a luminescent coating used in Casio G-Shock watches, applied to the hands and indices of the watch face. When exposed to daylight or artificial light, it glows in the dark, ensuring good readability at night. It is non-toxic, durable, and does not require battery power.
Dual Illuminator feature
Dual Illuminator
Dual Illuminator is a lighting system used in Casio G-Shock watches that simultaneously illuminates the watch face and digital display. This ensures full readability in complete darkness. The system is activated manually or automatically (when the wrist is raised) and operates independently of external light sources.

Reviews with photos

Review summary

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Number of reviews: 2

  1. A...
    100%

    An excellent watch from a reputable brand. This is yet another Casio model I own and I am always satisfied. Sturdy, durable, and distinctive in appearance. I wholeheartedly recommend it.

  2. M... Review confirmed by purchase
    100%

    The watch offers good quality at an affordable price. The only drawback might be the backlight operated by the LIGHT button, which is typical for G-SHOCK models, but the hands illuminate automatically in complete darkness.

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