G-STEEL

2100 Series

GBM-2100A-4B

Name: GBM-2100A-4B
Brand: G-SHOCK
SKU: GBM-2100A-4BER

NEW 08/2025

Introducing the GBM-2100—a sleek fusion of modern design and advanced tech, featuring a bold steel bezel, Smartphone Link connectivity, and a Tough Solar charging system, all packed into the iconic compact form you love. Built with sustainability in mind, the case and band incorporate bio-based resin, offering both environmental awareness and everyday durability. GBM-2100A-4B has a bold burgundy dial and refined silvery indexes. With its tough construction and contemporary style, the GBM-2100 transitions effortlessly from casual to professional - delivering performance, presence, and personality.

Features

Shock resistant
20 bar water resistant
Keeps yourself in time
Stable solar power
Easy to operate via smartphone
Easy to see in darkness

Specifications

Case size (L× W× H)

49.3 × 44.4 × 11.9 mm
Weight

72 g
Case and bezel material

Bio-based Resin / Stainless steel
Band

Bio-based resin band
Construction

Shock Resistant
Water resistance

200-metre water resistance
Time adjustment

Bluetooth: Connects to a smartphone and automatically adjusts the time
Power supply and battery life

Tough Solar (Solar powered)
Country of origin

China

Smartphone Link feature

Mobile link (Wireless linking using Bluetooth®)
Apps

CASIO WATCHES
App connectivity feature

Auto time adjustment

Easy watch setting

Approximately 300 world time cities

Time & place

Reminder

Phone finder

World time

World time 38 time zones (38 cities + coordinated universal time), 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

Countdown 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/hourly time signal

5 daily alarms

Hourly time signal
Light

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)
Light color

LED: White
Calendar

Full auto-calendar (to year 2099)
Mute feature

Button operation tone on/off
Energy saving feature

Power Saving (display goes blank to save power when the watch is left in the dark)
Battery display/alert

Battery level indicator
Run time

Approx. battery operating time: 7 months on rechargeable battery (operation period with normal use without exposure to light after charge) 18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Accuracy

Accuracy: ±15 seconds per month (with no mobile link function)
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)

Regular timekeeping: Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (battery level, mode) Digital: Hour, minute, second, pm, month, date, day

Features

Metal bezel accentuating an octagonal form

A stainless-steel bezel and inner case made with glass fibre-reinforced resin safeguards the module. Inheriting the design concept of the very first G-SHOCK with its iconic octagonal form, the bezel is crafted in a meticulous process of forging, cutting, and polishing. A circular hairline finish applied to the top surface and a mirror polish on the sides give the bezel a beautiful gleam.

Metal bezel of the GBM-2100 G-SHOCK watches

High-contrast face for readability and beauty

The dial incorporates a horizontal grid pattern applied with transparent printing, accentuating the dimensionality of the LCD and inset dial. A metallic texture is achieved with vapor deposition, while a phosphorescent finish is applied to the hands and indexes, improving readability in the dark.

Close-up of the three high-contrast analogue faces of the G-SHOCK GBM-2100 watches

Solar-powered timekeeping with Bluetooth® for enhanced accuracy and reliability

The watches come with Smartphone Link and Tough Solar, while still retaining the slim profile for which the 2100 line is known. These functions eliminate the trouble of time setting and regular battery replacement, offering even greater convenience for everyday use. Combining stylish design and practicality, this lineup of lifestyle watches is tailored to everyday needs, but adds a special flair.