G-Shock 2100 Series Watch in Black. G-Shock 2100 Series Watch in Black. Go sleek, sharp, and bold with the new black band and silver stainless steel bezel GM2100-1A 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 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.. Resin and stainless steel bezel and case with resin band and mineral glass Neobrite and shock resistance. LED light for the face LED backlight for the digital display. 200-meter water-resistance 31 time zones. 1/100-second stopwatch Measuring modes: Elapsed time, split time, 1st-2nd place times. Countdown timer Five daily alarms. 12/24-hour format Approx 3-year battery life. Case measures approx 1.94 x 1.75 x 0.46. CASI-ML5. GM2100-1A. For over 25 years Casio G-Shock digital watches have been the ultimate in fashionably tough watches providing durable, waterproof digital watches for your every activity.