Shock Resistant 200M Water Resistant Auto LED Light with Afterglow World Time 29 time zones (27 cities), city code display, daylight saving on/off 4 Daily Alarms & 1 Snooze Alarm Countdown Timer Measuring unit: 1 second Countdown range: 1 minute to 60 minutes Auto-repeat Function, Time-Up Alarm, Progress Beeper 1/100 second stopwatch Measuring capacity: 59’59.99” Measuring modes: Elapsed time, split time, 1st-2nd place times Hourly Time Signal Auto Calendar (pre-programmed until the year 2039) 12/24 Hour Formats Accuracy: +/-15 seconds per month Battery CR1220 Approximate Battery Life: 3 Years Module 4737 Size of case/total weight: 44.7 x 44.9 x 14.5mm / 142g