100M Water Resistant LED Light with Afterglow World Time 31 times zones (48 cities + UTC), daylight saving on/off, home city/world time swapping 5 Alarms (one-time alarm or daily alarm) Hourly Time Signal 1/100 second stopwatch Measuring capacity: 23:59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times Countdown Timer Measuring unit: 1/10 second Input range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) Full auto-calendar (pre-programmed until the year 2099) 12/24 Hour Formats Button operation tone on/off Accuracy: +/- 30 seconds per month Battery: CR2025 Approx. battery life: 10 years Module: 3198