Go sleek, sharp, and bold with the new black band and silver-tone stainless steel bezel Casio G-Shock GM2100-1A watch in a metal-clad octagonal take on the original iconic design. Forged in stainless steel with rounded hairline finish, the strong bezel says super style all the way. The dial is treated with 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 steelBlack resin bandNeobriteShock ResistantMineral Glass200-meter water resistanceDouble LED lightLED 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/off1/100-second stopwatchCountdown timer5 daily alarmsHourly time signalHand shift featureFull auto-calendar (to year 2099)12/24-hour formatButton operation tone on/offRegular timekeepingAnalog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day)Digital: Hour, minute, second, pm, month, dateAccuracy: +/-15 seconds per monthApprox. battery life: 3 years on SR726W x 2Size of case : 49.3x44.4x11.8mmCasio G-Shock Style #: GM2100-1A