Start with strong, lightweight carbon fiber, then add rugged style in a handsome black and gray color scheme. Now you’re ready for anything. Designed for pros working in tough environments, this Bluetooth Quad Sensor GRAVITYMASTER takes advantage of carbon fiber’s exceptional strength-to-weight ratio to take timekeeping to entirely new heights. The bezel, made from carbon fiber inserts pressed between layers of resin, delivers outstanding toughness and practicality. And you can count on the exceptional functionality everyone expects from a G-SHOCK watch. Take to the skies with the GRAVITYMASTER GRB200-1B, boasting an innovative design for pilots who challenge the most extreme conditions high in the sky, presented in an all-black color scheme that stands for serious strength. Approx. battery life: 2 years on CR2025. Resin Band. Vibration resistant. Shock Resistant. Mineral Glass / Spherical Glass. Imported.