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Whatever you’re doing, wherever you are — the G-SHOCK Master of G line has your back. Based on GRAVITYMASTER, MUDMASTER, and MUDMAN models that deliver peak performance in punishing conditions in the air and on land, this line features a black watch case symbolizing toughness, with accents in vivid emergency colors that capture the world of professionals involved in rescue efforts and other critical missions. The organic form of the GRAVITYMASTER GR-B300EC is inspired by next-generation aircraft and rendered with a seamless exterior design. The Carbon Core Guard structure and wide 3D face deliver durability, readability, and a comfortable fit. Enjoy all the practical functions as well, including dual-time simultaneously showing the time in two cities, a flight log memory function for recording routes traveled, and more.SPECIFICATIONSCase size (L× W× H): 59 × 54.7 × 15.7 mmWeight: 71 gBand: Bio-based resin bandConstruction: Shock Resistant, Carbon Core Guard structureWater resistance: 200-meter water resistanceTime adjustment: Bluetooth: Connects to a smartphone and automatically adjusts the timePower supply and battery life: Tough Solar (Solar powered)Smartphone Link feature: Mobile link (Wireless linking using Bluetooth®)Apps: CASIO WATCHESApp connectivity feature: Auto time adjustment, Easy watch setting, Approximately 300 world time cities, Flight log, Phone finderGlass: Mineral GlassCrown: Screw Lock CrownSurface treatment: Black ion plated bezelCompatible band size: 145 to 215 mmOther: NeobriteWorld time: Dual time (Home City time swapping)Stopwatch: 1-second stopwatch Measuring capacity: 23:59'59. Measuring modes: Elapsed time, split timeTimer: Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments)Alarm/hourly time signal: Daily alarmLight: LED light (Super Illuminator) AfterglowLight color: LED:WhiteCalendar: Full auto-calendar (to year 2099)Energy saving feature: Power Saving (hands stop to save power when the watch is left in the dark)Battery display/alert: Battery level indicatorRun time: Approx. battery operating time: 5 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)Accuracy: ±15 seconds per month (with no mobile link function)Other features: Date display, Day indicator, Regular timekeeping: Analog: 3 hands (hour, minute (hand moves every 10 seconds), second), 3 dials (dual time hour and minute, dual time 24-hour, day)
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