Surface treatment Black ion plated case Black ion plated band Glass Sapphire crystal with glare-resistant coating World time 5 World time 39 time zones (39 cities +coordinated universal time), daylight saving on/off, Home city/World time city swapping, auto summer time (DST) switching Stopwatch 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 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 LED backlight (Super illuminator) Full auto LED light, selectable illumination duration (2 seconds or 4 seconds), afterglow Light color LED:White 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 Low battery alert Run time Approx. battery operating time: 10 months on rechargeable battery (operation period with normal use without exposure to light after charge) 22 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 (with no signal calibration and mobile link function) Other features 12/24-hour format Date/month display swapping Day display (days of the week selectable in six languages) Regular timekeeping: Hour, minute, second, pm, month, date, day Time adjustment details Time Calibration Signals Station name: DCF77 (Mainflingen, Germany) Frequency: 77.5 kHz Station name: MSF (Anthorn, England) Frequency: 60.0 kHz Station name: WWVB (Fort Collins, United States) Frequency: 60.0 kHz Station name: JJY (Fukushima, Fukuoka/Saga, Japan) Frequency: 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga) Station name: BPC (Shangqiu City, Henan Province, China) Frequency: 68.5 kHz Time calibration signal reception Auto receive up to six* times a day (remaining auto receives canceled as soon as one is successful) *5 times a day for the Chinese calibration signal Manual receive The latest signal reception results Case size (L× W× H) 49.3 × 43.2 × 13 mm Weight 104 g