The G-Shock GSTB500D-1A1 blends bold style with advanced technology, featuring a silver stainless-steel case and bracelet with a black dial for a refined yet rugged look. Its Carbon Core Guard structure ensures strength and shock resistance, while the slim 12.8mm profile and downsized button guards offer a comfortable, easy-to-wear design. Powered by Tough Solar technology, it delivers up to 7 months of battery life (or 18 months in power-save mode) and includes Bluetooth® connectivity via the CASIO WATCHES app for auto time adjustment, world time (≈300 cities), reminders, and phone finder. With 200m water resistance, dual Super Illuminator LEDs, five daily alarms, stopwatch, countdown timer, and a full auto-calendar (to 2099), this watch is built for precision and performance. The GSTB500D-1A1 is the perfect balance of durability, intelligence, and modern style. - Case Size: 46.6 × 48.9 × 12.8mm - Weight: 143g - Materials: Resin and stainless-steel case/bezel, stainless-steel band with one-touch 3-fold clasp - Structure: Carbon Core Guard, shock resistant - Water Resistance: 200m - Power: Tough Solar (solar powered) with power-saving mode and battery level indicator - Battery Life: Approx. 7 months (normal use) / 18 months (power save mode) - Connectivity: Bluetooth® Smartphone Link via CASIO WATCHES app — auto time adjustment, world time (≈300 cities), time & place, reminders, and phone finder - Glass: Mineral glass -Functions: • World Time: 38 time zones with city name display and DST switching • Stopwatch: 1/100-sec up to 60 mins, then 1-sec up to 24 hrs • Timer: Countdown up to 60 mins • Alarms: 5 daily alarms + hourly time signal • Calendar: Full auto-calendar (to 2099) • Light: Dual Super Illuminator LED (face + digital display, selectable duration) • Other: Mute function, hand shift feature, 12/24-hour format, multilingual day display - Accuracy: ±15 seconds per month (without mobile link) - Display: Analog (2 hands + 1 dial) and digital (hour, minute, second, date, day)