Features: shock resistant (g-shock) magnetic resistant led light auto light switch, selectable illumination duration, afterglow world time 29 time zones (48 cities + coordinated universal time), daylight saving on/off, home city / world time city swapping 1/1000-second stopwatch measuring capacity 9959'59.999'' measuring modes elapsed time, lap time, split time others speed (0 to 1998 units / hour), distance input (0.0 to 99.9) mach indicator (speed exceeding 1225 units / hour) countdown timer measuring unit 1 second input range 1 minute to 24 hours (1-minute increments and 1-hour increments) other auto-repeat daily alarms 5 independent daily alarms (4 one-time alarms and 1 snooze alarm) hourly time signal full auto-calendar (to year 2099) 12/24-hour format regular timekeeping analog 2 hands (hour, minute (hand moves every 20 seconds) digital hour, minute, second, pm, month, date, day accuracy ±15 seconds per month approx.Battery life 2 years on cr1220 size of case / total weight: 55.0 x 51.2 x 16.9 mm / 70g