Casio G-SHOCK GA-2100K Series Analogue Digital Watch (GA-2100K-1AER)

Overview

The Casio G-SHOCK GA-2100K-1A combines the iconic octagonal design of the G-SHOCK 2100 Series with a distinctive aesthetic inspired by the energy and atmosphere of nightlife. Featuring a deep piano-black dial, vibrant neon green accents and a matte translucent black bezel and strap, this analogue-digital watch captures the visual contrast of laser lighting cutting through smoky club and festival environments.

Beneath its contemporary appearance, the GA-2100K-1A retains the exceptional durability that defines G-SHOCK. Its Carbon Core Guard construction provides lightweight shock resistance, while 200-metre water resistance, double LED illumination and a comprehensive range of timekeeping functions make it a practical choice for everyday wear and outdoor activities. Measuring just 11.8 mm thick and weighing only 51 g, it delivers impressive toughness in a slim, comfortable design.

Key Features

• Iconic octagonal G-SHOCK 2100 Series design
• Distinctive piano-black dial with contrasting neon green accents
• Matte translucent black resin bezel and strap inspired by atmospheric nightlife
• Newly developed smooth dial finish with a refined, high-gloss appearance
• Carbon Core Guard structure for lightweight shock resistance
• 200-metre water resistance for demanding everyday and outdoor use
• Analogue-digital display combining traditional hands with digital functionality
• Double LED Super Illuminator for improved visibility in darkness
• World Time covering 31 time zones and 48 cities, plus UTC
• 1/100-second stopwatch and 24-hour countdown timer
• Five daily alarms and hourly time signal
• Hand Shift function for an unobstructed view of the digital display
• Neobrite luminous coating for improved visibility in low light
• Approximately three-year battery life
• Lightweight 51 g construction with a slim 11.8 mm profile

Specifications

• Model: GA-2100K-1A
• Collection: G-SHOCK 2100 Series
• Display: Analogue and digital
• Case Dimensions: 48.5 × 45.4 × 11.8 mm
• Weight: 51 g
• Case & Bezel Material: Carbon / resin
• Strap: Matte translucent resin band
• Compatible Wrist Size: 145–215 mm
• Glass: Mineral glass
• Construction: Shock Resistant, Carbon Core Guard
• Water Resistance: 200 metres (20 bar)
• Power Source: Two SR726W batteries
• Battery Life: Approximately 3 years
• Timekeeping Accuracy: ±15 seconds per month
• Illumination: Double white LED Super Illuminator
• Additional Features: Neobrite, Hand Shift and automatic calendar
• Country of Manufacture: Thailand

Nightlife-Inspired Design

The GA-2100K-1A introduces a bold new interpretation of the classic G-SHOCK octagonal silhouette. Inspired by the interplay of darkness, smoke and vibrant lighting found in clubs and music festivals, the design combines contrasting materials and finishes to create a distinctive contemporary appearance.

A newly developed dial surface provides a smooth, refined foundation for the deep piano-black finish, creating an impression of depth beneath the watch glass. Bright neon green details across the dial and hands provide striking contrast, recalling the appearance of laser beams against a dark background.

The matte translucent black bezel and strap introduce a softer, smoky texture that complements the glossy dial. This combination of transparent materials, contrasting finishes and vivid colour accents gives the GA-2100K-1A a distinctive identity while retaining the instantly recognisable proportions of the G-SHOCK 2100 Series.

Carbon Core Guard Protection

The GA-2100K-1A features Casio's Carbon Core Guard structure, which uses carbon fibre-reinforced resin to protect the internal watch module against shocks and impacts. This advanced construction combines strength with low weight, allowing the watch to maintain its slim 11.8 mm profile without compromising the durability expected from G-SHOCK.

The carbon-reinforced case is complemented by a flexible resin strap designed for comfortable extended wear. Weighing just 51 g, the watch is particularly well suited to users who prefer a lightweight timepiece that remains comfortable during long working days, travel and physical activity.

With 200-metre water resistance, the GA-2100K-1A is suitable for swimming, wet weather and demanding outdoor conditions. Its shock-resistant construction and durable mineral glass provide additional protection against the knocks and impacts encountered during everyday use.

Analogue-Digital Timekeeping

The GA-2100K-1A combines the traditional appearance of an analogue watch with the convenience of a multifunction digital display. Two central hands provide clear hour and minute indications, while a dedicated day indicator and digital display provide access to additional timekeeping information.

The integrated Hand Shift function temporarily moves the analogue hands away from the digital display, ensuring important information remains visible when the hands would otherwise obstruct the screen.

For international travel and working across different time zones, the watch includes World Time covering 31 time zones and 48 cities, plus Coordinated Universal Time (UTC). Daylight saving settings can be adjusted where required, making it easy to monitor the time in different locations.

Double LED Super Illuminator

The GA-2100K-1A features Casio's Double LED Super Illuminator system, providing separate white LED illumination for the analogue dial and digital display. This dual-light arrangement improves visibility in darkness, allowing users to check the time and access digital functions in low-light environments.

Illumination duration can be selected between 1.5 and 3 seconds, with an afterglow function providing additional visibility after activation. Neobrite luminous coating also supports analogue time reading in low-light conditions following exposure to light.

Whether checking the time during an evening run, working in poorly illuminated environments or travelling after dark, the illumination system provides practical visibility without compromising the watch's distinctive appearance.

Watch Features & Functions

• World Time: 31 time zones covering 48 cities plus Coordinated Universal Time (UTC), with daylight saving settings.
• Stopwatch: 1/100-second measurement for the first 60 minutes, switching to one-second measurement thereafter, with a maximum measuring capacity of 23 hours, 59 minutes and 59 seconds.
• Stopwatch Modes: Elapsed time, split time and first/second-place finish times.
• Countdown Timer: Adjustable from one second to 24 hours, with one-second, one-minute and one-hour setting increments.
• Daily Alarms: Five independent daily alarms.
• Hourly Time Signal: Optional audible signal every hour.
• Double LED Light: Separate white LED illumination for the analogue dial and digital display, with selectable 1.5-second or 3-second duration and afterglow.
• Hand Shift: Temporarily moves the analogue hands away from the digital display for improved visibility.
• Full Auto Calendar: Automatically adjusts the date through to 2099.
• Time Format: Selectable 12 or 24-hour digital display.
• Button Tone: Option to enable or disable button operation sounds.
• Analogue Display: Hour and minute hands, with the minute hand advancing every 20 seconds, plus a dedicated day indicator.
• Digital Display: Hours, minutes, seconds, AM/PM, month and date.

Built for Everyday Reliability

The GA-2100K-1A offers the durability and functionality expected from G-SHOCK in a distinctive design that works equally well for everyday wear and active use. Its lightweight Carbon Core Guard construction, slim profile and flexible resin strap provide a comfortable fit without sacrificing strength or impact protection.

A conventional battery-powered movement delivers approximately three years of operation using two SR726W batteries, providing dependable timekeeping without the need for regular charging. Combined with 200-metre water resistance, practical timing functions and dual LED illumination, the watch offers reliable performance across a wide range of environments.

Why Choose the Casio G-SHOCK GA-2100K-1A?

The GA-2100K-1A combines the enduring appeal of the G-SHOCK 2100 Series with a distinctive design inspired by contemporary music and nightlife culture. Its deep piano-black dial, vibrant neon green accents and matte translucent black resin construction create a striking alternative to traditional solid-colour G-SHOCK models.

Beyond its appearance, the watch delivers the practical performance that has made the GA-2100 Series so popular. Carbon Core Guard protection, 200-metre water resistance, double LED illumination and comprehensive digital functions provide dependable everyday versatility, while the lightweight 51 g construction ensures comfortable wear. For anyone seeking an analogue-digital G-SHOCK that combines distinctive styling with proven durability, the GA-2100K-1A is an excellent choice.

Authorised Casio Retailer

TacTree is an authorised Casio UK retailer. All Casio watches supplied are 100% genuine, brand new and sourced through approved UK distribution channels. Orders are supplied with official Casio packaging and manufacturer documentation for complete authenticity and peace of mind.