Casio G-Shock GMAS2100GA-7A S-Series Unisex Watch is designed to be the perfect combination of fashion and functionality. The flat face and simple bar index marks come together in a streamlined, satisfying design. An original spin in on-trend green for details like the logo, index mark, and LCD makes this watch a perfect street fashion accessory. Case / bezel material: Carbon / Resin. Resin Band. Mineral Glass. Neobrite. Shock Resistant. Carbon Core Guard structure. 200-meter water resistance. 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). World time: 31 time zones (48 cities + coordinated universal time), daylight saving on/off, 1/100-second stopwatch. Measuring capacity: 00'00''00~59'59''99 (for the first 60 minutes), 1:00'00''~23:59'59'' (after 60 minutes). Measuring unit: 1/100 second (for the first 60 minutes), 1 second (after 60 minutes). Measuring modes: Elapsed time, split time, 1st-2nd place times. Countdown timer. Measuring unit: 1 second.Countdown range: 24 hours.Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments). 5 Daily alarms. Hourly time signal. Hand shift feature. Full auto-calendar (to year 2099). 12/24-hour format. Button operation tone on/off. Regular timekeeping. Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day).Digital: Hour, minute, second, pm, month, date. Accuracy: ±15 seconds per month. Approx. battery life: 3 years on SR726W × 2.