Case and bezel material:Carbon / Resin , Resin Band , Construction , Shock Resistant , Carbon Core Guard structure , 200-meter water resistance , Smartphone Link/App Connectivity Features , Smartphone Link feature , Mobile link (Wireless linking using Bluetooth) , Apps, CASIO WATCHES , App connectivity feature, Auto time adjustment , Easy watch setting , Approximately 300 world time cities , App information, Time & place , Phone finder , Exterior , Glass, Mineral Glass , Compatible band size-145 to 215 mm , World time , 38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping , 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 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) , Alarm/hourly time signal , 5 daily alarms , Hourly time signal , Light , LED backlight (Super Illuminator) , Auto light switch, selectable illumination duration (1.5 seconds or 3 seconds), afterglow , Light color , LED:White , Calendar , Full auto-calendar (to year 2099) , Mute feature , Button operation tone on/off , Accuracy , Accuracy: ±15 seconds per month (with no 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 , Power supply and battery life- Approx. battery life: 3 years on CR2016 , Case size (L× W× H)-50.3 × 47 × 18.7 mm , Weight-59 g .