Casio G-SHOCK GRAVITYMASTER Men Watch – Black | GR-B300EC-1ADRCasio G-SHOCK GRAVITYMASTER Men Watch – Black | GR-B300EC-1ADR combines aviation-inspired styling with vivid emergency-color accents and advanced everyday functionality. It features Tough Solar charging, Bluetooth Smartphone Link, Carbon Core Guard construction, dual time, flight-log recording, Super Illuminator lighting, and 200-meter water resistance. Casio G-SHOCK GRAVITYMASTER Men Watch – Black | GR-B300EC-1ADR is part of the MASTER OF G AIR Emergency Colors collection. Its solid black exterior is highlighted with vivid red, orange, and yellow accents inspired by rescue equipment and professional safety gear, creating a high-contrast design that improves readability while delivering a bold aviation-inspired appearance. Inspired by next-generation aircraft, the watch features a seamless exterior, a wide three-dimensional dial, and a Carbon Core Guard structure made with lightweight carbon fiber-reinforced resin. The case and band incorporate bio-based resin, while a black ion-plated bezel and screw-lock crown add durability and a premium finish. Tough Solar technology converts natural and artificial light into power. Bluetooth connectivity links the watch to the CASIO WATCHES app for automatic time adjustment, easy settings, access to approximately 300 world-time cities, Flight Log recording, and Phone Finder. Dual Time simultaneously displays the time in two cities for convenient travel and aviation use. The GR-B300EC-1ADR also includes a 1-second stopwatch, 24-hour countdown timer, daily alarm, Super Illuminator LED light, Power Saving, battery-level indicator, and 200-meter water resistance. Its analog display and large dimensional indexes provide clear visibility in demanding environments. MASTER OF G AIR GRAVITYMASTER designEmergency Colors black finishRed, orange, and yellow dial accentsAircraft-inspired seamless exteriorCarbon Core Guard structureShock Resistant constructionTough Solar chargingBluetooth Smartphone LinkCASIO WATCHES app compatibilityAutomatic time adjustmentFlight Log functionApproximately 300 app-based world-time citiesDual Time displayBlack ion-plated bezelScrew-lock crownBio-based resin case and bandSuper Illuminator LED light200-meter water resistanceSpecificationDetailsBrandCasioSeriesG-SHOCK MASTER OF G AIRModelGR-B300EC-1ADRCollectionGRAVITYMASTER Emergency ColorsColorBlack with Red, Orange and Yellow AccentsProduct TypeMens WatchDisplayAnalogMovementTough Solar QuartzCase & Bezel MaterialBio-Based Carbon / Bio-Based Resin / Stainless SteelStructureCarbon Core GuardConstructionShock ResistantBezel TreatmentBlack Ion PlatingBand MaterialBio-Based ResinGlassMineral GlassCrownScrew-Lock CrownWater Resistance200 m / 20 BarPower SupplyTough SolarCase Size59 54.7 15.7 mmWeight71 gCompatible Wrist Size145215 mmConnectivityBluetoothSmartphone LinkMobile Link via BluetoothCompatible AppCASIO WATCHESAutomatic Time AdjustmentYesEasy Watch SettingYesApp World TimeApprox. 300 CitiesFlight LogYesPhone FinderYesWorld TimeDual Time with Home-City Time SwappingStopwatch1-SecondStopwatch CapacityUp to 23 Hours, 59 Minutes and 59 SecondsStopwatch ModesElapsed Time and Split TimeCountdown TimerUp to 24 HoursTimer Setting Range1 Minute to 24 HoursAlarmDaily AlarmLightSuper Illuminator LEDAfterglowYesLED ColorWhiteNeobriteYesDate DisplayYesDay IndicatorYesPower SavingYesBattery Level IndicatorYesBattery Operating TimeApprox. 5 Months Without Light ExposurePower-Save Operating TimeApprox. 18 Months After Full ChargeCalendarFull Auto Calendar to 2099Accuracy15 Seconds per Month Without Mobile LinkAnalog Timekeeping3 Hands and 3 Inset Dials