Water lovers take note! The ideal companion for anyone into marine sports. The WS1300H-1AV starts with a durable black resin exterior design, 100-meter water resistance, and 10-year battery life. Then add on-board tide graph, moon data, and LED light ensuring an easy read even in the dark, to deliver everything a water sports enthusiast needs, right at your fingertips. With stopwatch, timer, and alarm, these versatile timepieces take you seamlessly from home or office to the pool or ocean. Specifications Case / bezel material: Resin Resin Band Resin Glass 100-meter water resistance LED light Selectable illumination duration (1.5 seconds or 3 seconds), afterglow Moon data (Moon age of the 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 setting range: 1 minute to 24 hours (1-minute increments and 1-hour increments) Others: Auto-repeat 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 (to year 2099) 12/24-hour format Button operation tone on/off Regular timekeeping: Hour, minutes, seconds, am/pm, month, date, day Accuracy: ±30 seconds per month Approx. battery life: 10 years on CR2025 Size of case : 51.3×51.1×14.8mm Total weight : 49g