World time 31 time zones (48 cities + coordinated universal time), daylight saving on/off Stopwatch 1/100-second stopwatch Measuring capacity: 23:59'59.99'' Measuring modes: Elapsed time, split time, 1st-2nd place times Timer Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) Alarm/hourly time signal 5 daily alarms (with 1 snooze alarm) Hourly time signal Light Electro-luminescent backlight Full auto EL light, selectable illumination duration (1.5 seconds or 3 seconds), afterglow Light color EL:Blue Green Calendar Full auto-calendar (to year 2099) Mute feature Button operation tone on/off Energy saving feature Power Saving (display goes blank to save power when the watch is left in the dark) Battery display/alert Battery level indicator Run time Approx. battery operating time: 11 months on rechargeable battery (operation period with normal use without exposure to light after charge) 27 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) Accuracy Accuracy: 15 seconds per month Other features 12/24-hour format Regular timekeeping: Hour, minute, second, pm, month, date, day 55.5 53.6 17.5 mm Weight 88 g Case and bezel material Case / bezel material: Resin Band Resin Band Construction Shock Resistant Mud Resistant Water resistance 200-meter water resistance Power supply and battery life Solar powered