Casio G-SHOCK GA-2100K Series Analogue Digital Watch (GA-2100K-2AER)

Overview

The Casio G-SHOCK GA-2100K-2A brings a vibrant new identity to the iconic octagonal G-SHOCK 2100 Series. Inspired by the atmosphere of music festivals, nightlife and laser lighting, this distinctive analogue-digital watch combines a smoky translucent blue case and strap with a deep piano-black dial and contrasting orange accents. The result is a contemporary interpretation of the classic G-SHOCK design, balancing expressive styling with the durability and practicality that have defined the collection for decades.

Beneath its striking appearance, the GA-2100K-2A incorporates Casio's advanced Carbon Core Guard structure, providing exceptional shock resistance within a lightweight, slim-profile case. With 200-metre water resistance, Double LED Super Illuminator technology, World Time functionality and a comprehensive selection of digital timing features, it delivers dependable performance for everyday wear and outdoor activities. Weighing just 51 g and measuring only 11.8 mm thick, the watch offers impressive toughness without unnecessary bulk.

Key Features

• Iconic octagonal G-SHOCK 2100 Series design
• Smoky translucent blue resin bezel and strap with a distinctive matte finish
• High-gloss piano-black dial with contrasting orange accents
• Contemporary design inspired by laser lighting and the atmosphere of nightlife
• Smooth dial finish that enhances the depth and appearance of the black background
• Carbon Core Guard structure for lightweight shock resistance
• 200-metre water resistance for swimming and outdoor activities
• Analogue-digital display with separate day indicator
• Double LED Super Illuminator for improved visibility in darkness
• World Time covering 31 time zones and 48 cities, plus UTC
• 1/100-second stopwatch with elapsed and split-time measurement
• 24-hour countdown timer for training and everyday timing tasks
• Five daily alarms and optional hourly time signal
• Hand Shift function for an unobstructed view of the digital display
• Neobrite luminous coating for improved low-light visibility
• Approximately three-year battery life
• Lightweight 51 g construction with a slim 11.8 mm profile

Specifications

• Model: GA-2100K-2A
• 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
• Case Colour: Translucent blue
• Dial Colour: Piano black with orange accents
• Strap: Translucent blue 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 full auto calendar

Translucent Blue Design with Orange Accents

The GA-2100K-2A offers a distinctive approach to the classic G-SHOCK aesthetic, using transparency, colour and contrasting finishes to create a contemporary watch with a strong visual identity. Its smoky translucent blue bezel and strap evoke the appearance of atmospheric lighting passing through a haze-filled environment, while the matte resin finish provides a subtle, understated texture.

At the centre of the design is a deep piano-black dial with a smooth, glossy appearance. The dark surface creates a striking backdrop for the orange accents, which introduce a vibrant contrast reminiscent of coloured laser beams and lighting effects found at music festivals and nightlife venues.

The combination of cool blue resin, warm orange detailing and a dark dial gives the GA-2100K-2A a distinctive appearance without departing from the familiar proportions of the 2100 Series. Its octagonal bezel remains instantly recognisable, while the translucent construction adds visual depth and a more contemporary character than conventional solid-colour G-SHOCK models.

Carbon Core Guard Protection

The GA-2100K-2A features Casio's Carbon Core Guard structure, which uses carbon fibre-reinforced resin to protect the internal watch module against shocks and impacts. This lightweight yet robust construction is central to the slim design of the 2100 Series, providing dependable protection without requiring a bulky case.

The reinforced case is complemented by a flexible resin strap designed to remain comfortable during extended periods of wear. At just 51 g, the watch offers a particularly lightweight alternative to larger sports watches, making it suitable for long working days, travel and active lifestyles.

With 200-metre water resistance, the GA-2100K-2A is suitable for swimming, wet weather and demanding outdoor conditions. Durable mineral glass provides additional protection for the dial, while G-SHOCK's shock-resistant construction helps safeguard the movement against everyday knocks and vibration.

Analogue-Digital Timekeeping

The GA-2100K-2A combines the traditional appearance of an analogue watch with the convenience of digital timekeeping functions. Two central hands provide clear hour and minute indications, while a separate day indicator and integrated digital display offer additional information without compromising the clean, balanced appearance of the dial.

The practical Hand Shift function temporarily moves the analogue hands away from the digital display when they obstruct important information. This makes it easier to read stopwatch measurements, countdown settings and other digital functions without waiting for the hands to move naturally.

World Time functionality covers 31 time zones across 48 cities, plus Coordinated Universal Time (UTC), with selectable daylight saving settings. This makes the watch useful for international travel, coordinating activities across different regions and monitoring time differences.

Double LED Super Illuminator

The GA-2100K-2A incorporates Casio's Double LED Super Illuminator system, providing separate white LED illumination for the analogue dial and digital display. This dual-light arrangement helps maintain readability in low-light environments, allowing users to check the time and access digital functions after dark.

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 following exposure to light.

Whether checking the time during evening activities, travelling after dark or working in poorly illuminated environments, the illumination system provides practical visibility while complementing the watch's distinctive dark dial and contrasting colour accents.

Watch Features & Functions

• World Time: 31 time zones covering 48 cities plus Coordinated Universal Time (UTC), with daylight saving on/off 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 for reminders and scheduled activities.
• Hourly Time Signal: Optional audible alert 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.

Lightweight Durability for Everyday Wear

Despite its distinctive appearance, the GA-2100K-2A remains a practical everyday watch designed around comfort and reliability. Its slim 11.8 mm case sits comfortably on the wrist, while the lightweight carbon-reinforced construction reduces bulk during extended wear.

The flexible resin strap provides a secure, comfortable fit, while the watch's shock-resistant structure and 200-metre water resistance make it suitable for a wide variety of activities and environments. Its straightforward analogue-digital interface provides convenient access to essential timekeeping functions without unnecessary complexity.

Powered by two SR726W batteries, the GA-2100K-2A offers approximately three years of operation under normal conditions. This low-maintenance design makes it a dependable choice for users who prefer a conventional battery-powered watch rather than a device requiring frequent charging.

Why Choose the Casio G-SHOCK GA-2100K-2A?

The GA-2100K-2A combines the enduring appeal of the G-SHOCK 2100 Series with a distinctive translucent blue colourway inspired by contemporary music and nightlife culture. Its smoky blue resin construction, deep piano-black dial and contrasting orange accents create a unique appearance that stands apart from traditional G-SHOCK designs.

Beyond its styling, the watch delivers the proven performance expected from the G-SHOCK name. Carbon Core Guard protection, 200-metre water resistance, Double LED Super Illuminator technology and comprehensive timekeeping functions provide dependable versatility, while the lightweight 51 g construction ensures comfortable everyday wear. For anyone seeking a robust analogue-digital watch that combines contemporary design with practical functionality, the GA-2100K-2A offers an excellent balance of durability, comfort and distinctive styling.

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.