Power supply and battery life Approx. battery life: 3 years on CR2016 Back plate Screw Lock Back Compatible band size 145 to 205 mm 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) Other: Auto-repeat Alarm/hourly time signal Multi-function alarm Hourly time signal Flash alert feature Flash alert Flashes with buzzer that sounds for alarms, hourly time signal, countdown timer time up alarm Light LED backlight (Super Illuminator) Afterglow Light color LED:White Calendar Full auto-calendar (to year 2099) Accuracy Accuracy: ±15 seconds per month Other features 12/24-hour format Regular timekeeping: Hour, minute, second, pm, month, date, day Case size (L× W× H) 48.9 × 42.8 × 13.5 mm Weight 78 g