Case / bezel material: Stainless steel Resin Band Mineral Glass Shock Resistant Screw Lock Back 200-meter water resistance Tough Solar (Solar powered) LED backlight (Super illuminator)Full auto LED light, selectable illumination duration (2 seconds or 4 seconds), afterglow 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 Time Calibration Signals - Station name: DCF77 (Mainflingen, Germany)Frequency: 77.5 kHzStation name: MSF (Anthorn, England)Frequency: 60.0 kHzStation name: WWVB (Fort Collins, United States)Frequency: 60.0 kHzStation name: JJY (Fukushima, Fukuoka/Saga, Japan)Frequency: 40.0 k - Hz (Fukushima) / 60.0 k - Hz (Fukuoka/Saga)Station name: BPC (Shangqiu City, Henan Province, China)Frequency: 68.5 k - Hz Mobile link (Wireless linking using Bluetooth ) 5 World time39 time zones (39 cities +coordinated universal time), daylight saving on/off, Home city/World time city swapping, auto summer time (DST) switching 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 minute to 24 hours (1-minute increments and 1-hour increments) 5 daily alarms (with 1 snooze alarm) Hourly time signal Low battery alert Power Saving (display goes blank to save power when the watch is left in the dark) Full auto-calendar (to year 2099) 12/24-hour format Button operation tone on/off Date/month display swapping Day display (days of the week selectable in six languages) Regular timekeeping: Hour, minute, second, pm, month, date, day Accuracy: ±15 seconds per month (with no signal calibration and mobile link function) 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)