This g-shock gravitymaster timepiece is designed for pilots who challenge the most extreme conditions high in the sky. The large numerals "6" and "12" and the orange markers are designed for quick readability 54. 0mm biol-based resin case with mineral crystal shock resistant with carbon core guard structure bluetoothâ® connectivity allows recording of flight data such as location latitude and longitude, date, and time features include world time, countdown timer, stopwatch, daily alarms, full auto-calendar, and super illuminator led light tough solar recharges the battery black bio-based resin strap; buckle clasp water resistant to 200 meters we are an authorized casio dealer