Casio G-Shock x GM-5600 Series ft. Stone Adventurer 40th Anniversary (Limited Edition) Men Casual Sports Rectangle 200m Water Resistant Watch GM-5640GEM-1D GM5640GEM GM5640 GM-5640 GM-5640GEM Celebrate four decades of rugged innovation with our limited-edition Adventurer's Stone timepieces, inspired by ancient navigational stones. Each metal-clad watch features unique mineral-inspired colors and textures, paired with commemorative design elements, to create a truly one-of-a-kind collector's item. Battery Life / Accuracy Approximately 2 years (+/-15 seconds per month) Crystal Mineral crystal Light Electro-luminescent backlight (afterglow) Case & Band Material Resin / stainless steel case with resin band Water Resistance 200m / 20 bar Case Size Thickness: 12.9 mm Diameter: 43.2 mm Length: 49.6 mm Other Specifications Casio G-Shock x GM-5600 Series ft. Stone Adventurer 40th Anniversary (Limited Edition) Shock resistant 1/100-second stopwatch Countdown timer (auto-repeat) Multi-function alarm Hourly time signal Flash alert (flashes with buzzer for alarm, hourly time signals) Full auto-calendar (to year 2099) 12/24-hour format Regular timekeeping (digital display)