product specification Case / bezel material: Resin Resin Band Resin Glass Water Resistant LED light 1/100-second stopwatch Measuring capacity: 59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times daily alarm Hourly time signal Auto-calendar (set at 28 days for February) 12/24-hour format Regular time keeping: hour, minute, second, pm, date, day Accuracy: ±30 seconds per month Approx. battery life: 7 years on CR2016