Case / bezel material: Resin Resin Band Resin Glass 100-meter water resistance LED backlight Afterglow LED:Amber Dual time 1/100-second stopwatch Measuring capacity: 23:59'59.99'' Measuring modes: Elapsed time, split time, 1st-2nd place times Countdown timer Measuring unit: 1 second 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) Other: Auto-repeat 5 multi-function alarms (with 1 snooze alarm) Hourly time signal Full auto-calendar (to year 2099) 12/24-hour format Button operation tone on/off Regular timekeeping: Hour, minute, second, pm, month, date, day Accuracy: ±30 seconds per month Approx. battery life: 10 years on CR2032 Size of case : 54.4 × 51.3 × 15.8 mm Total weight : 61g