Casio G-Shock Tough Solar Bluetooth Grey Dial Men's Watch | GBM-2100A-8B

The Casio G-shock GBM-2100A-8B Men's Watch delivers a perfect blend of style, functionality, and sustainability in a sleek, compact package. Featuring a bold stainless-steel bezel and a sophisticated grey analog-digital dial, this 44.4mm octagonal case stands out with subtle elegance while remaining versatile for casual or business settings. Constructed with bio-based resin components for the case and strap, the watch offers lightweight comfort and eco-conscious design without compromising durability. Equipped with Tough Solar technology and Bluetooth® Smartphone Link, it provides automatic time adjustment, phone finder, reminders, and access to over 300 world time cities. Scratch-resistant mineral glass, Double LED illumination, shock resistance, and 200-meter water resistance ensure reliable performance in any environment. Lightweight at 72g, the GBM-2100A-8B combines advanced G-SHOCK toughness, smart connectivity, and refined aesthetics, making it ideal for modern men who demand both style and practicality in their everyday timepiece.Available at Watch Zone. UPC: 4549526407772

Smartphone Link/App Connectivity Features
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), 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
Operation Guide (Opens in a new tab)