.The G-SHOCK GA-2100 Utility Black Series is a new twist on the original iconic stealth model GA-2100-1A1 model, born by adding fluorescent highlights. These watches retain the simplified bezel lettering and black dial of the original, and the GA-2100-1A2ER has neon blue details on the hands, hour marker tips, day indicator, and dial labels. The lightweight GA-2100 is still the slimmest G-SHOCK men’s model, and features a a Carbon Core Guard structure with an interior case made of carbon fiber-reinforced resin. Other features include world time, stopwatch, countdown timer, 5 alarms, and double LED light with LCD backlight.Model Number GA-2100-1A2ERBrand Casio24 Hour Counter NoAdditional Information 5 Daily Alarms: Each will sound every day at the time you set, Hourly time signal, Auto Calendar, Carbon Core Guard Structure, Countdown Timer, Dual Illuminator, Shock Resistant, World TimeAlarm YesBacklight YesMaximum Bracelet Length 160 - 210mmBracelet Material ResinCase Diameter 45Case Thickness 12Lug Length 48Lug Width 26Case Material ResinDate Display NoDay Display YesDial Colour BlackDisplay Type Analogue & DigitalEAN 4549526319235Gender GentsGift Box CasioGlass Type MineralGuarantee 2 Years Manufacturers (International)Luminous Hands YesMovement QuartzStopwatch YesStyle SportsWater Resistance 200 m (20 ATM)