The G-Shock GSTB400BD-1A2 G-Steel Limited Edition Watch is both durable and stylish. Compact and weighing 160g, it's comfortable for daily wear. With tough resin/stainless steel construction, it's shock-resistant and water-resistant up to 200 meters. Powered by Tough Solar, it's eco-friendly and reliable. Features include smartphone link, world time, stopwatch, timer, and alarm. The double LED light ensures visibility. With a mute feature, power-saving mode, and full auto-calendar, it's convenient. Battery life varies, lasting up to 7 months with normal use and 18 months in total darkness. Accurate to ±15 seconds per month, it's a dependable choice for any occasion. - 46.9×49.6×12.9mm Case Size - 160g Weight - Resin/Stainless steel Case and Bezel - Stainless Steel Band - Shock Resistant - Carbon Core Guard structure - 200 Meters Water Resistant - Tough Solar (Solar powered) - Smartphone Link feature: Mobile link (Wireless linking using Bluetooth®) - 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) - 12/24-hour format