G-SHOCK GA-B2100BEG-1A - Analog-Digital Octagon
G-SHOCK GA-B2100BEG-1A - Analog-Digital Octagon
Electro green against black is a combination G-SHOCK has used for decades, and it works because the green is only ever an accent.
The GA-B2100BEG is the solar and Bluetooth model in the 2100 Series, on the thin Carbon Core Guard case in carbon-reinforced and bio-based resin, with a band of biomass plastics. Tough Solar removes the battery change and mobile link hands the timekeeping to the CASIO WATCHES app.
Black case and band with green across the face, 45.4 mm across and 11.9 mm deep, 52 grams. Skeleton hands over the LCD, Neobrite on the markers, double LED lighting both. Module 5689 gives world time across 38 zones, a stopwatch, a countdown timer and daily alarms, holding fifteen seconds a month unlinked. 200 m water resistant.
The connected 2100 with a bit of colour in it. Reads black at a glance and green when the light hits.
Perfect for: black and green G-SHOCK watches, solar Bluetooth watches, thin analog-digital watches.
Specifications
- Collection
- 2100 Series
- Case Diameter
- 45.4 mm
- Case Thickness
- 11.9 mm
- Case Material
- Carbon / Resin-bio
- Crystal
- Mineral Glass
- Water Resistance
- 200 m (20 ATM)
- Dial Color
- Black / Green
- Movement
- Solar
- Caliber
- Casio module 5689
- Functions
- World time, Stopwatch, Countdown timer, Alarm, Auto calendar, Bluetooth, Solar charging
- Strap / Bracelet
- Resin Band (Biomass plastics)
- Strap Color
- Black
- Reference
- GA-B2100BEG-1A
- Released
- 2026-05-05
- Case Size
- 48.5 x 45.4 x 11.9 mm
- Weight
- 52 g
- Finish
- Neobrite
- Construction
- Shock Resistant; Carbon Core Guard structure
- Band Size
- 145 to 215 mm
- Power
- Tough Solar (Solar powered)
- Accuracy
- ±15 seconds per month (with no mobile link function)
- Time Adjustment
- Bluetooth: Connects to a smartphone and automatically adjusts the time
- Calendar
- Full auto-calendar (to year 2099)
- Smartphone Link
- Mobile link (Wireless linking using Bluetooth®)
- Illumination
- Double LED light LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
- World Time
- 38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping
- Stopwatch
- 1/100-second stopwatch Measuring capacity: 00'00''00~59'59''99 (for the first 60 minutes) 1:00'00~23:59'59 (after 60 minutes) Measuring unit: 1/100 second (for the first 60 minutes) 1 second (after 60 minutes) Measuring modes: Elapsed time, lap/split time
- Timer
- Measuring unit: 1 second Countdown range: 60 minutes Countdown start time setting range: 1 second to 60 minutes (1-second increments and 1-minute increments)
- Alarm
- 5 daily alarms; Hourly time signal
- Other Features
- Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.); 12/24-hour format; Date/month display swapping; Day display (days of the week selectable in six languages); Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (battery level, mode) Digital: Hour, minute, second, pm, month, date, day