Casio G-Shock GA-B2100C-9A Tough Solar (Bluetooth) Men's Watch

The Casio G-Shock GA-B2100C-9A Tough Solar is a bold and ultra-durable Men’s Watch designed for everyday toughness and modern smart features. Its 45.4mm Carbon Core Guard case combines carbon and resin for exceptional shock resistance while remaining lightweight at just 52g. The striking yellow bezel and resin band contrast sharply with the black dial, creating a sporty, standout look. Powered by Tough Solar technology, the watch ensures long-lasting performance without frequent battery changes. With Bluetooth® Smartphone Link, it connects to the CASIO WATCHES app for convenient functions like auto time adjustment, easy watch settings, and access to approximately 300 world time cities, plus Time & Place logging. Built for reliability, it features 200 meters of water resistance, mineral glass, a fixed yellow resin bezel, and luminous Neobrite for visibility. Completed with a comfortable tang clasp and backed by a 2-year warranty, the GA-B2100C-9A is the perfect blend of rugged G-Shock toughness, solar efficiency, and smart connectivity. Available at Watch Zone BD. UPC: 4549526322778

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

Watch Features:

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
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