GR-B300RY-1A9DR This G-SHOCK MASTER OF G GRAVITYMASTER model features a bright rescue-yellow bio-based resin band with a black bio-based carbon, bio-based resin, and stainless steel case and bezel, paired with a bold black analog dial for a high-contrast aviation-inspired look. Built with shock-resistant construction, Carbon Core Guard structure, mineral glass, Tough Solar power, a screw-lock crown, and 200-meter water resistance, it combines lightweight durability with demanding outdoor capability. Confirmed functions include Bluetooth smartphone connectivity, automatic time adjustment, dual time, world time for approximately 300 cities through the CASIO WATCHES app, flight log memory, a 1-second stopwatch, 24-hour countdown timer, daily alarm, phone finder, full auto-calendar, battery level indicator, power saving, and Super Illuminator LED lighting, making it a practical choice for travel, aviation-inspired use, and active everyday wear.