The G-Shock GAB2100-3A Bluetooth Solar 'CasiOak' blends modern tech with rugged durability. Its compact size (48.5×45.4×11.9mm, 52g) and carbon/resin construction make it lightweight yet tough. Powered by Tough Solar, it's eco-friendly and reliable. Bluetooth® connectivity adds convenience, while world time, stopwatch, timer, and alarm functions enhance versatility. With a double LED light for visibility, a full auto-calendar, and ±15 seconds per month accuracy, it's ready for any adventure. - 48.5×45.4×11.9mm Case Size - 52g Weight - Carbon/Resin Case and Bezel　 - Resin Band - Shock Resistant - Carbon Core Guard structure - 200 Meters Water Resistant - Tough Solar (Solar powered) - Smartphone Link feature: Mobile link (Wireless linking using Bluetooth®) - Mineral Glass - 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 - Timer - Alarm/hourly time signal - 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) - Calendar: Full auto-calendar (to year 2099) - Mute feature: Button operation tone on/off - Power Saving (display goes blank to save power when the watch is left in the dark) - 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: ±15 seconds per month (with no mobile link function) - 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)