Since 1983, the G-SHOCK collection of durable watches has undergone continuous refinement in its quest for unparalleled toughness. The octagonal GBM-2100 models are the latest iteration, integrating Bluetooth® and solar capabilities into the GM-2100 design. Crafted from bio-based resin, the bands ensure both durability and environmental consciousness. Versatile in nature, these models seamlessly transition from casual to business settings. Representing a significant functional advancement within the iconic style of the 2100 series, the new GBM-2100 models unite durability with aesthetic appeal. - 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)