While maintaining the iconic octagonal form of the GA2100 inherited from the very first G-SHOCK, the GAB2100 now also has Smartphone Link and Tough Solar power capabilities. It also employs the Carbon Core Guard structure to preserve a similar fit on the wrist as the original model.
The dual-layer dial construction highlights the dimensionality of the LCD and inset dial. Meticulous attention to detail gives the dial a look of enhanced texture, especially the different surface treatments we apply to the dial face and inset dial.
Features : 
Tough Solar (solar-powered)
Easy to operate via smartphone
Easy to see in darkness
Reminder setting: The watch will remind you of up to five upcoming events, which you set within the app.
Case size (L× W× H) 48.5 × 45.4 × 11.9 mm
Weight 52 g
Case/bezel material: Carbon / Resin　
Resin Band
Mineral Glass
Neobrite
Carbon Core Guard structure
Shock Resistant
Water resistance