 
      Complete your favorite retro look with the Octagon GA-2100 collection which adopts the original G-SHOCK design concept, features Smartphone Link and Tough Solar power.
Specification
Basic Information
Case size (W×W×H)
48.5 × 45.4 × 11.9 mm
Weight
52g
Case and bezel material
Case/bezel material: Carbon/Resin
Watch Band
Resin Band
Construction
Shock Resistant
Carbon Core Guard structure
Water resistance
Water resistance 200 meters
Power supply and battery life
Tough Solar (Solar Powered)
Smartphone Link/Application Connectivity Features
SmartphoneLink feature
Mobile link (Connect wirelessly using Bluetooth®)
Application
CASIO WATCH
Application connectivity features
Automatic time adjustment
Practical watch settings
About 300 world time cities
Time & place
Reminder
Cellphone finder
Exterior
Glass
Mineral Glass
Function
Neobrites
Clock feature
world time
Stopwatch
Countdown
Hourly time alarm/signal
5 daily alarms
Hourly time signal
Light
Light color
LEDs: White
Calendar
Fully auto-calendar (to year 2099)
Silent feature
Operation button sound on/off
Energy saving feature
Power Saving (screen turns off to save power when the watch is in the dark)
Battery display/alert
Battery level indicator
operating time
Estimated battery operating time: 7 months for rechargeable batteries (operating period under normal use without exposure to light after charging) 18 months for rechargeable batteries (operating period when stored in complete darkness with power-saving function activated after full charge)
accuracy
Accuracy: ±15 seconds per month (without mobile link function)
Another feature
Hand shift feature (Hands shift out of the way to get in the way of displaying digital content.)
12/24 hour format
Date/month display swap
Day display (day of the week selectable in six languages)
Standard timekeeping