Specifications: Shock Resistant Mud Resistant Auto Dual EL Backlights with Afterglow Low Temperature Resistant (-20 C/-4 F) World Time 29 time zones (48 cities), city code display, daylight saving on/off 1/100 second stopwatch (ST1) Measuring capacity: 999:59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times Other: Auto-Start 1/100 second stopwatch (ST2) Measuring capacity: 999:59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times Countdown timer Measuring unit: 1 second Countdown start time setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) Others: Auto-repeat, progress beeper 4 Multi-function alarms & 1 snooze alarm Hourly time signal Full auto-calendar (pre-programmed until the year 2099) 12/24 hour formats Button operation tone on/off Flash alert Accuracy: +/-15 seconds per month Battery CR2025 Approx. battery life: 3 years