This dual featured G-Shock GSTB500BD-1A G-Steel Black Stainless-Steel Men's Watch leaves nothing behind, delivering a more compact design with all the G-Shock attributes. The resin case and textured bezel mix meticulously with the one-touch 3-fold stainless steel clasp. The slim button guards offer an easy to operate function that allows for Bluetooth connectivity and solar power charging among other things. Toughness is embedded in the carbon core guard that absorbs external shocks; a notorious element of the G-Shock framework. Gentlemen witness true sophistication at its core with the addition of this watch on your wrist. - 46.6×48.9×12.8mm Case Size - 143g Weight - Resin/Stainless steel Case and Bezel - Stainless Steel Band - Carbon Core Guard structure - Shock Resistant - 200 Meters Water Resistant - Tough Solar (Solar powered) - Smartphone Link feature: Mobile link (Wireless linking using Bluetooth®) - Time & place - Reminder - Phone finder - Mineral Glass - World time: 38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping - Stopwatch - Timer - Alarm/hourly time signal - Double LED light LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) - Calendar: Full auto-calendar (to year 2099) - Mute feature: Button operation tone on/off - Power Saving (display goes blank to save power when the watch is left in the dark) - Approx. battery operating time: *7 months on rechargeable battery (operation period with normal use without exposure to light after charge) *18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) - Accuracy: ±15 seconds per month (with no mobile link function) - Hand shift feature (Hands move out