Casio G-Shock x Master Of G ft. Land Series aka Mudmaster Men Sports Round 200m Water Resistant Watch GG-B100XM-1A GGB100XM GGB100 GG-B100 GG-B100XM Conquer the extreme with the Casio G-Shock Mudmaster GG-B100X series, engineered for adventurers who operate in the harshest environments. These rugged Master of G timepieces feature a quad sensor system with digital compass, altimeter/barometer, thermometer, and step counter for complete situational awareness. The new 5744 module enables Location Memory tools via Bluetooth connectivity with the Casio Watches app. Module / Movement 5744 (quartz) Battery Life / Accuracy Approximately 2 years (+/-15 seconds per month without mobile link function) Crystal Mineral crystal (curved) Light Double LED light (auto LED light, super illuminator, selectable illumination duration, afterglow) Case / Band Material Bio-based carbon / stainless steel case with bio-based resin band Water Resistance 200m / 20 bar Case Size Thickness: 19.4 mm Diameter: 51.3 mm Length: 55.4 mm Lug width: Integrated Other Specifications Casio G-Shock x Master Of G ft. Land Series aka Mudmaster Shock resistant Mud resistant Carbon core guard structure World time (38 time zones, daylight saving on/off, home/world time city swapping) Sunrise, sunset time display (timing for specific dates) 1/100-second stopwatch (up to 24 hours, elapsed time, split time) 1-second countdown timer (up to 24 hours) 5 daily alarms Hourly time signal Full auto-calendar (to year 2099) Button operation tone on/off 12/24-hour format Hand shift feature (hands move out of the way to provide an unobstructed view of digital display contents) Regular timekeeping (analog-digital display) Smartphone Link / App Connectivity Features Mobile link (wireless linking via Bluetooth) Auto time adjustment (approximately 300 world time cities) Life log data, mission log Location indicator / memory Mode / display switching customization Auto altitude correction Phone finder Enhanced Features and Functions Step counter (0 to 999,999 step count display range) Altimeter (measuring -700 to 10,000 meters) Barometer (260 to 1,100 hPa) Digital compass (0° to 359°) Thermometer (-10°C to 60°C)