Go sleek, sharp, and bold with the new green band and dark gray ion-plated bezel Casio G-Shock GM2100B-3A watch in a metal-clad octagonal take on the original iconic design. Forged in stainless steel with a rounded hairline finish, the strong bezel says super style all the way. The dial is treated with a vapor deposition finish for a meticulously detailed metallic look that suits a classic metal G-Shock timepiece. Incremental variations in the detailed square dot texturing on the wristband take casual urethane materials up a notch. Case/bezel material: Resin/Stainless steel Green resin band Neobrite Shock Resistant Mineral Glass Dark gray ion-plated bezel 200-meter water resistance 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) World time: 31 time zones (48 cities + coordinated universal time), daylight saving on/off 1/100-second stopwatch Countdown timer 5 daily alarms Hourly time signal Hand shift feature Full auto-calendar (to the year 2099) 12/24-hour format Button operation tone on/off Regular timekeeping Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day) Digital: Hour, minute, second, pm, month, date Accuracy: ±15 seconds per month Approx. battery life: 3 years on SR726W × 2 Size of case: 49.3×44.4×11.8mm Casio G-Shock Style #: GM2100B-3A