Casio AQW100B-3AVCF 200M Water Resistant, EL Backlight with afterglow, Moon Data (moon age of input data, moon phase graph), Tide Graph (tide level for specific date and time) Dual time, 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 second, Countdown range: 24 hours,Countdown start time seting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) Others: Auto-repeat, time-up alarm, Multi-function alarms,3 independent multi-function alarms (2 one-time alarms and 1 snooze/one-time alarm), Alarm type: Daily Alarm, date alarm, 1-month alarm, monthly alarm Hourly time signal, Full auto-calendar (pre-programmed until the year 2099), 12/24 Hour Format,Button tone operation on/off, Accuracy: 30 seconds per month, Battery SR927W x 2, Approx. battery life: 3 years, Module 5028, Size of case / total weight: 48.2 x 46.0 x 14.5mm / 54g