CASIO G-SHOCK GA-100BEG-1ADR ANALOG-DIGITAL BLACK ELECTRO GREEN WATCH

The GA-100BEG-1ADR is the Black and Electro Green colourway on G-Shock's most iconic chunky silhouette — the GA-100, the watch that defined what a modern G-Shock looks like. At 55mm long, 51.2mm wide, and 72 grams, this is a deliberately big, deliberately bold, deliberately unapologetic G-Shock that makes no attempt to be slim or subtle. The matte black case wraps a textured grid/waffle-pattern dial with twin electro green LCD windows at 6 o'clock, green-accented subdials at 9 and 3, silver applied baton indexes, and a green-tipped second hand. It's the largest, heaviest, and most visually aggressive member of the Black and Electro Green collection — the one you choose when wrist presence matters more than profile.

Module 5081 is a pure analog-digital G-Shock — no Bluetooth, no solar, no step counter, no app. What it has instead is one of the most capable stopwatch systems in the G-Shock range: 1/1000-second precision with a dedicated speed subdial at 3 o'clock that calculates speed from 0 to 1,998 units per hour, distance input from 0.0 to 99.9 units, and a Mach indicator that triggers when measured speed exceeds 1,225 units/hour. The left subdial at 9 o'clock shows alarm, signal, auto-light, and snooze status. Magnetic resistance adds a layer of protection the GA-B010 and GA-B2100 don't have. World time covers 48 cities, the countdown timer goes to 24 hours with auto-repeat, and the amber LED auto-light activates with a wrist tilt. At $199 it's the most affordable BEG variant — no solar premium, no Bluetooth premium, just pure G-Shock tool-watch DNA in the electro green treatment.

At a Glance

Why You'll Love It

• The GA-100 is the quintessential chunky G-Shock — at 55mm × 51.2mm × 16.9mm it delivers maximum wrist presence and the bold, aggressive silhouette that made G-Shock a cultural icon. This is not a watch that hides under a sleeve; it's a watch that is the sleeve.
• The electro green twin LCD windows glowing from the textured black dial create the most dramatic BEG effect in the collection — more visible green surface area than the GA-B2100 or GA-B010, framed by the grid/waffle texture that adds depth and shadow.
• The 1/1000-second stopwatch with speed calculator and Mach indicator is unique to the GA-100 — no other BEG model has this level of chronograph precision. The dedicated speed subdial at 3 o'clock is a functional instrument, not decoration.
• Magnetic resistance is an added protection layer the GA-B010 and GA-B2100 don't have — the GA-100 resists magnetic fields that can affect quartz accuracy.
• No Bluetooth, no solar, no app dependency. Battery in, wear it, forget about it for 2 years. The simplest, most self-contained BEG option for people who want a watch, not a connected device.
• At $199, this is the most accessible entry point into the Black and Electro Green collection — $40 less than the solar Bluetooth GA-B010 and GA-B2100.

Perfect For

Key Features

• 1/1000-second stopwatch with speed and Mach indicator — The most precise stopwatch in the BEG collection. Measures to 99:59'59.999 with elapsed, lap, and split modes. The speed subdial at 3 o'clock calculates speed from distance input (0.0–99.9 units), and the Mach indicator triggers above 1,225 units/hour. A genuine instrument, not a gimmick.
• Textured grid/waffle dial with twin electro green LCDs — The raised grid pattern adds physical texture and shadow depth to the matte black dial. The twin green-tinted LCD windows at 6 o'clock (time/day on left, day/date on right) create the most vivid green glow in the BEG collection.
• Magnetic resistance — Protection against magnetic fields that can affect quartz accuracy. An added durability layer that the GA-B010 and GA-B2100 BEG models don't include.
• Amber LED with auto-light — The wrist-tilt auto-light activates the amber LED without a button press — useful for checking time in the dark during any activity. Selectable 1.5s or 3s duration with afterglow.
• World time — 48 cities, 29 time zones — Home city/world city swapping with DST.
• Zero connectivity, zero maintenance — No Bluetooth, no solar, no app. CR1220 battery runs approximately 2 years. The purest, most independent G-Shock in the BEG collection.

Technical Specifications

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Frequently Asked Questions

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