Quartz movement Protective mineral crystal protects watch from scratches Case diameter: 40 mm Auto LED light with afterglow Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving Description .auto-style1 { font-family: "Times New Roman"; font-size: 12pt; color: #000000; }  Tide Graph Moon Phase Data Displays moon age and phase for current or designated day 100M Water Resistant Auto LED Light with afterglow Dual Time 4 Daily Alarms and 1 Snooze Alarm Countdown Timer Measuring unit: 1 second Countdown range: 1 minute to 60 minutes Auto-repeat function 1/100 second stopwatch Measuring capacity: 99:59'59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times Hourly Time Signal Auto Calendar (pre-programmed until the year 2039) 12/24 Hour Formats Accuracy: +/-30 seconds per month Battery CR2025 Approx. battery life: 10 years Module 2926