Never replace you battery again The G-SHOCK lineup of Tough Solar watches with a large-capacity solar power generation system continues to evolve with these new additions. Features include a full-auto EL backlight automatically illuminates the display whenever the watch is angled towards the face while available lighting is dim, 30-record Telememo, World Time, and more. All this plus Tough Solar in a compact, highly fashionable design. The G-2310 is a handsome, high-quality timepiece with a urethane bezel and band. The G-2310 features a bezel with stainless steel parts, which accent a bold face design. , 200 M SHOCK Resistant 200M Water Resistant Accuracy: ± 15 seconds per month Timekeeping Mode: Hour, minute, second, am/pm, year, month, day of week, 12/24-hour formats Other: Daylight saving time/ Standard time Calendar system: Auto-calendar (pre-programmed until the year 2039 Telememo Mode: Up to 30 sets of data, each set including name (8 characters) and telephone number (14 digists) Other: Auto sort, Remaining memory screen Alarm Mode: 5 multi-function alarms; hourly time signal World Time: 27 cities ( 29 time zones ) Stopwatch Mode: Measuring unit: 1/100 of a second Measuring capacity: 23 hours, 59 minutes, 59.99 seconds Measuring mode: Elapsed time, split time, two finishes Other: Auto -Start function Countdown Alarm Mode: Input range: from 1 second to 24 hours Measuring unit: 1/10 of a second Other: Auto-repeat function Other: Backlight (electro-luminescent panel), Auto Light Switch function (operates only in the dark). Sleep Mode, Auto Display function. Storage Battery: Type ML2016 NOTE: This watch is equipped with a solar cell and storage battery (secondary battery) that charged by the electrical power produced by the solar cell. Storage battery drops from a full charge in about 6 months if the watch is not exposed to light, with one backlight operation (2 seconds) and 20 seconds of alarm operation per day. Module No.: 2184 -Shock resistant(G-SHOCK) -Electro-luminescent backlight Full auto EL light -Solar powered -World Time Current time in 27 cities(29 time zones), city code display, daylight saving on/off -30 Telememo pages 8 letters and 14 numbers per page Others: Auto-sort, remaining memory display -1/100-second Stopwatch Measuring capacity: 23:59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times Other: Auto-start -Countdown timer Input range:1 sec, to 24 hr. Unit: 1/10 second Other: Auto-repeat -Multi-function alarms -5 independent multi-function alarms -Hourly time signal -Battery power indicator -Auto-calender(to year 2039) -12/24-hour formats -Regular timekeeping: Hour, minutes, seconds, am/pm, year, month, date, day -Accuracy: +- 15 seconds per month -Approx. battery life: 6 months on ML2016(Storage battery(Secondary battery)) -Size of case/total weight G-2310 .............52.5 x 46.4 x 15.6 mm/ 65g G-2310D............52.5 x 46.4 x 15.6 mm/ 131 g