Ocean lovers take note! Digital watches with large case and handy functions that anyone into marine sports will love. The heavy-duty design with rugged case shape and multi-window face evokes the look of mechanical gears. Featuring an LCD inspired by a cool-gadget look, these timepieces deliver the info you need in a clearly visible, easy read. As much function as style, the tide graph, moon data, 10-year battery life, and water resistance up to 100 meters deliver what you need on your most active days. Case / bezel material: Resin Resin Band Resin Glass 100-meter water resistance LED backlight Selectable illumination duration (1.5 seconds or 3 seconds), afterglow LED:Amber Dual time Tide graph (tide level for specific date and time) Moon data (moon age of a specific date, moon phase graph) 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) Other: 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 Button operation tone on/off Full auto-calendar (to year 2099) 12/24-hour format Regular timekeeping: Hour, minute, second, am/pm, month, date, day Accuracy: Çï¶Ï30 seconds per month Approx. battery life: 10 years on CR2025 Size of case : 52.5 _ 48.6 _ 15.2 mm Total weight : 48 g