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. 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 200-meter water resistance Power supply and battery life Approx. battery life: 3 years on SR726W X 2 World time for over 300 cities 1/100-second stopwatch Home time/world time switching Double LED light (Super Illuminator)LED:White Countdown timer 5 daily alarms Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.) Bluetooth® is a registered trademark of Bluetooth SIG, Inc. Style: GS-GAB21001A-JUN22