Multi-Band Atomic Timekeeping (US, UK, Germany, Japan) Receives time calibration radio signals which keep the displayed time accurate Auto receive function (up to 6 times per day) Manual receive function Signal:US WWVB, UK MSF, Germany DCF77, Japan JJY40/JJY60 Frequency:US 60kHz, UK 60kHz, Germany 77.5kHz, Japan 40/60kHz Tough Solar Power 200M Water Resistant Tide Graph (based on a combination of preset and user input data) Moon Data (moon age based on current date or user input data, moon phase graph) Digital Compass 16 points of measurement Measuring range: 0 to 359 degrees Measuring unit: 1 degree Bearing Memory Memory Capacity: 1 record (stored direction angle and indicator) Altimeter Measuring range: -700 to 10,000m (-2,300 to 32,800ft) Measuring unit: 5m (20ft) Auto memory measurements Altimeter Memory Memory capacity: 20 records Measurement data: altitude, month, date, time Max altitude memory Relative altitude display Altitude tendency graph Altitude differential graphic Barometer Display range: 260 to 1,100 hPa (7.65 to 32.45 inHg) Display unit: 1 hPa (0.05 inHg) Atmospheric pressure tendency graph Atmospheric pressure differential grapic Thermometer Display range: -10 to 60 C (14 to 140 F) Display unit: 0.1 C (0.2 F) Low Temperature Resistant (-10 C / 14 F) Full Auto EL Backlight with Afterglow World Time 29 times zones (33 cities), city code display, daylight saving on/off 5 Daily Alarms Countdown (Yacht) Timer Measuring unit: 1 second Countdown range: 1 minute to 60 minutes Countdown Alarm, Progress Beeper 1/100 second stopwatch Measuring capacity: 23:59 '59.99" Measuring modes: Elapsed time, split time, 1st-2nd place times Hourly Time Signal Auto Calendar (pre-programmed until the year 2099) 12/24 Hour Formats Button operation tone on/off Accuracy: +/-20 seconds per month (with no signal calibration) Storage Battery CTL1616 Battery Power Indicator Power Saving Function Approx. battery life: 5 months on full charge with Power Saving Function (without further exposure to light) Module 3134