{"product_id":"casio-g-shock-gr-b300h-5ajf-gravitymaster-bluetooth-tough-solar-carbon-core-guard","title":"Casio G-SHOCK GR-B300H-5AJF GRAVITYMASTER — Bluetooth Tough Solar Carbon Core Guard","description":"\u003ch2\u003eG-SHOCK GRAVITYMASTER GR-B300H — Master in Horizon Gold\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eMASTER OF G - AIR line \/ Released August 2026\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe GR-B300H-5AJF is part of the G-SHOCK MASTER OF G series' new \"Master in Horizon Gold\" design, inspired by the golden horizon where earth meets sky. The GRAVITYMASTER GR-B300H combines light yellow gold IP and brown IP accents with a dark brown resin band to express the raw power of nature. It features Carbon Core Guard construction, pairing a carbon-fiber-reinforced resin case with a seamless bezel inspired by next-generation aircraft for a bold, resilient form.\u003c\/p\u003e\n\n\u003cp\u003eThis model includes a home-time swap function and a dual time function, useful for overseas travel. Large, three-dimensional hour markers and a metal bezel that emphasizes the wide face improve visibility and functionality. A dual-coil motor drives the disc hand at the 9 o'clock position, adding rotational expression for the alarm on\/off indicator, stopwatch, and battery indicator. It does not include sensors — no compass, no altimeter\/barometer, and no thermometer.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eGR-B300H-5AJF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eG-SHOCK MASTER OF G - AIR \/ GRAVITYMASTER\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase size\u003c\/td\u003e\n\u003ctd\u003e59 × 54.7 × 15.7 mm \/ 2.32 × 2.15 × 0.62 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e71 g \/ 2.5 oz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCase \/ bezel material\u003c\/td\u003e\n\u003ctd\u003eCarbon fiber reinforced resin (biomass plastic) \/ resin (biomass plastic) \/ stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBand\u003c\/td\u003e\n\u003ctd\u003eResin band (biomass plastic)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGlass\u003c\/td\u003e\n\u003ctd\u003eMineral glass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater resistance\u003c\/td\u003e\n\u003ctd\u003e20-bar (200-meter)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStructure\u003c\/td\u003e\n\u003ctd\u003eShock resistant, Carbon Core Guard structure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTime correction\u003c\/td\u003e\n\u003ctd\u003eBluetooth (auto time correction via smartphone)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower source\u003c\/td\u003e\n\u003ctd\u003eTough Solar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMobile Link \/ App\u003c\/td\u003e\n\u003ctd\u003eCASIO WATCHES app — auto time correction, easy watch setting, world time (approx. 300 cities), flight log, phone finder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunctions\u003c\/td\u003e\n\u003ctd\u003eWorld time, Dual time (with home time swap), Stopwatch (1-sec, 24-hr, split), Timer (1-min unit, max 24 hr), Time alarm, LED light (Super Illuminator with afterglow), Full auto calendar, Power saving function, Battery indicator\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery life\u003c\/td\u003e\n\u003ctd\u003e~5 months (with functions) \/ ~18 months (power saving)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBand size\u003c\/td\u003e\n\u003ctd\u003e145–215 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelease date\u003c\/td\u003e\n\u003ctd\u003eAugust 2026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Japan Treasure Factory","offers":[{"title":"Default Title","offer_id":58363584315695,"sku":"GR-B300H-5AJF","price":355.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0982\/9679\/1343\/files\/GR-B300H-5AJF-01.avif?v=1787573060","url":"https:\/\/jtfwatches.com\/products\/casio-g-shock-gr-b300h-5ajf-gravitymaster-bluetooth-tough-solar-carbon-core-guard","provider":"Japan Treasure Factory","version":"1.0","type":"link"}