Case / bezel material: Carbon / Resin Resin Band Shock Resistant Carbon Core Guard structure 200-meter water resistance Battery SR726W X 2 Smartphone Link/App Connectivity Features Smartphone Link feature Mobile link (Wireless linking using Bluetooth) CASIO WATCHES Auto time adjustment Easy watch setting Approximately 300 world time cities Mineral Glass Neobrite World time 1/100-second stopwatch Countdown timer Diameter 46mm Case size (L W H) : 42.5 X 46 X 13.8 mm