The G-Shock GM2100B-4 Metal Covered 'CasiOak' is a sleek and versatile timepiece. With a compact 49.3×44.4×11.8mm case and 72g weight, it's comfortable for daily wear. Its resin/stainless steel construction offers durability, while being shock-resistant and water-resistant up to 200 meters. Powered by SR726W X 2 batteries, it provides approximately 3 years of battery life. Features include world time for 31 zones, stopwatch, timer, and alarm. The double LED light ensures visibility in any condition. With a full auto-calendar, mute feature, and hand shift function, it's convenient and accurate. Whether for work or play, the GM2100B-4 is a reliable choice for any occasion. - 49.3×44.4×11.8mm Case Size - 72g Weight - Resin/Stainless steel Case and Bezel - Resin Band - Shock Resistant - 200 Meters Water Resistant - Approx. battery life: 3 years on SR726W X 2 - Mineral Glass - World time: 31 time zones (48 cities + coordinated universal time), daylight saving on/off - 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 - Accuracy: ±15 seconds per month - 12/24-hour format - Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents.) - Regular timekeeping: *Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day) *Digital: Hour, minute, second, pm, month, date