Resin Glass / Spherical Glass 50-meter water resistance Case / bezel material: Resin Resin Band LED backlight, afterglow Dual time 1/100-second stopwatch Measuring capacity: 23:59'59.99'' Measuring modes: Elapsed time, split time, 1st-2nd place times Multi-function alarm (One-time or 7-time snooze) Hourly time signal Auto-calendar (to year 2099) 12/24-hour format Regular timekeeping: Hour, minutes, seconds, pm, year, month, date, day Accuracy: ±30 seconds per month Approx. battery life: 10 years on CR2025 Size of case/total weight: 43.9 X 35.7 X 12.5 mm/31.5 g LED:Greene: