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GSTB100-1A | Black G-STEEL Men's Watch G-SHOCK | CASIO,G-STEEL G-SHOCK GST-B100-1AJF メンズ 腕時計 ソーラー,GST-B100-1AJF | CASIO,GST-B100X-1A_JF_DR.jpg?v=,G-STEEL gショック ジーショック G-SHOCK Gスチール クロノG_SHOCKG_STEELGST_Tough solar (solar charging system). Water resistant to 20 ATM. Mobile link function (functions linked with Bluetooth communication with compatible mobile phones) World time: 38 cities around the world (38 time zones, with automatic daylight saving set) + UTC (Coordinated Universal Time) display and home city time switching function. 5 time alarms, time signal. Battery indicator display. Power saving function (after a certain time passes in a dark place, the display will turn off and save energy) Fully automatic calendar. Switch between 12 and 24 hour displays. ● Switch sound between ON/OFF Date display (month/date display replacement). Day of the week (English, West, French, Germany, I, and Dew) Double LED Lights: LED light for dial (super illuminator, afterglow function, afterglow time switch (1.5 seconds/3 seconds), LED backlight for LCD parts (super illuminator, afterglow function, afterglow time switching (1.5 seconds/3 seconds) included)