Since 1983, G-SHOCK's line of robust timepieces has been consistently refined to achieve unmatched durability. The latest addition to this legacy is the octagonal GBM-2100 models, which incorporate Bluetooth® and solar features into the GM-2100 design. Crafted from bio-based resin, the bands prioritize both longevity and eco-friendliness. With their versatile design, these models effortlessly shift between casual and professional settings. Marking a notable advancement in functionality within the iconic 2100 series, the new GBM-2100 models blend durability with aesthetic charm. - Module No. 5729 - 49.3 x 44.4 x 11.9mm Case Size - 72g Weight - Shock resistant (G-SHOCK) - Tough Solar (Solar powered) - Double LED light - Mobile link (Wireless linking using Bluetooth®) - Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents) - World time: 38 time zones (38 cities coordinated universal time), auto summer time (DST) switching, home city/world time city swapping, city code display, city name display, daylight saving on/off - Stopwatch - Countdown Timer - 5 Daily Alarms - Hourly Time Signal - Battery Level Indicator - Power Saving (display goes blank to save power when the watch is left in the dark) - Full auto-calendar (to year 2099) - 12/24-hour format - Button operation tone on/off - 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) *Digital: Hour, minute, second, pm, month, date, day - Accuracy: ±15 seconds per month (with no mobile link function) - 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)