Casio G-Shock x Master Of G ft. GravityMaster Men Casual Sports Round 200m Water Resistant Watch GR-B300-8A2 GRB300 GR-B300 Experience the ultimate in aviation-inspired timekeeping with a watch designed to thrive in harsh environments. Featuring a carbon core guard structure, flight log memory, and dual-time display, this watch is built for pilots and adventure-seekers alike. With its sleek design and eco-friendly materials, it's the perfect blend of form and function. Battery Life / Accuracy Tough solar (5 months without exposure to light) (+/-15 seconds per month) Crystal Mineral crystal Light LED light (super illuminator, afterglow) Case & Band Material Carbon / bio-based resin case with bio-based resin band Water Resistance 200m / 20 bar Case Size Thickness: 15.7 mm Diameter: 54.7 mm Length: 59.0 mm Other Specifications Casio G-Shock x Master Of G ft. GravityMaster Shock resistant Carbon Core Guard structure Mobile link (wireless linking via Bluetooth) Dual time (home city time swapping) Chronograph up to 24 hours in 1-second increment Countdown timer (up to 24 hours) Daily alarm Full auto-calendar (to year 2099) Power saving (hands stop to save power when left in the dark) Battery level indicator Day, date, dual time and 24-hour display Regular timekeeping (analog display)