This is the Casio G-SHOCK 2100 Series an Analog-Digital Watch Watch Features: Case size - (Lx Wx H) 48.5 x 45.4 x 11.9 mmWeight - 52 gCase / bezel material - Carbon / Resin Band - Resin BandConstruction - Shock Resistant Carbon Core Guard structureWater resistance - 200-meter water resistancePower supply and battery life - Tough Solar (Solar powered) Glass - Mineral GlassOther - Neobrite Smartphone Link/App Connectivity Features Smartphone Link feature - Mobile link (Wireless linking using BluetoothA(R))Apps - CASIO WATCHESApp connectivity featureAuto time adjustmentEasy watch settingApproximately 300 world time citiesTime & placeReminderPhone finderWorld time38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swappingStopwatch1/100-second stopwatchMeasuring capacity: 00&';00&';&';00~59&';59&';&';99 (for the first 60 minutes)1:00&';00~23:59&';59 (after 60 minutes)Measuring unit: 1/100 second (for the first 60 minutes)1 second (after 60 minutes)Measuring modes: Elapsed time, lap/split timeTimerCountdown timerMeasuring unit: 1 secondCountdown range: 60 minutesCountdown start time setting range: 1 second to 60 minutes (1-second increments and 1-minute increments)Alarm/hourly time signal5 daily alarmsHourly time signalLightDouble 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)Light colorLED: WhiteCalendarFull auto-calendar (to year 2099)Mute featureButton operation tone on/offEnergy saving featurePower Saving (display goes blank to save power when the watch is left in the dark)Battery display/alertBattery level indicatorRun timeApprox. 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)AccuracyAccuracy: 15 seconds per month (with no mobile link function)Other featuresHand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.)12/24-hour formatDate/month display swappingDay 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, mode)Digital: Hour, minute, second, pm, month, date, day Upgrade the iconic look you love with the octagonal GA2100 line, which inherits the design concept of the very first G-SHOCK, but now with Smartphone Link and Tough Solar power. Upgrade the iconic look you love with the octagonal GA2100 line, which inherits the design concept of the very first G-SHOCK, but now with Smartphone Link and Tough Solar power.