From the manufacturer

Key Features
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10 Year BatteryBuilt in 10 year battery, will provide a decade of use without the hassle of changing batteries |
100 Meter (330 feet) Water ResistanceSuitable for everyday use and swimming and snorkeling |
Moon Phase & Tide GraphTide graph Moon data (with Moon age indicator) |
LED light1/100-second stopwatch 3 alarms |