Specifications 100m water resistant LED light Selectable illumination duration (1.5 seconds or 3 seconds), afterglow Multi Time (4 different cities) World time 31 time zones (48 cities + coordinated universal time), daylight saving on/off, Home city/World time city swapping 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 Countdown range: 24 hours Countdown start time setting range: 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments) 5 daily alarms or one-time alarms Hourly time signal Full auto-calendar (to year 2099) 12/24-hour format Button operation tone on/off Regular timekeeping: Hour, minute, second, pm, month, date, day Accuracy: 30 seconds per month Approx. battery life: 10 years on CR2025 Module: 3458 Size of case / total weight AE1400WH ........48.4 x 51.4 x 14.4 mm / 49 g