Shock resistant (G-Shock) Electro-luminescent backlight 1/100 second stopwatch Measuring capacity: 23:59'59.99" Measuring mode: net time, split time, 1st-2nd place times Target time setting Auto start function Countdown alarm Input range: 1 to 60 minutes Measuring unit: 1/10 second Repeat function Hourly time signal Regular timekeeping: hour, minute, second, am/pm, month, date, day Auto-calendar (set at 28 days for February) 12/24-hour formats Accuracy: ± 15 seconds per month Battery: Approx. 2 years on CR2016