Electro-Luminescent Backlight with Afterglow Solar Powered Low-Temperature Resistant (-10 °C/14 °F) Digital Compass Measures and displays direction as one of 16 points Measuring Range: 0 to 359 ° Measuring Unit: 1 ° 20 Seconds Continuous Measurement Graphic Direction Pointer Bidirectional calibration and northerly calibration function Altimeter Measuring Range: -700 to 10,000 m (-2,300 to 32,800 ft.) Measuring Unit: 5 m (20 ft.) Auto Memory Measurements (up to 40 records, each including altitude, month, date, time) High Altitude / Low Altitude Memory Cumulative Ascent / Descent Memory Relative Altitude Display Altitude Tendency Graph Altitude Differential Graphic Altitude Alarm *Changeover between meters (m) and feet (ft.) 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 Graphic *Changeover between hPa and inHg Thermometer Display range: -10 to 60 °C (14 to 140 °F) Display Unit: 0.1 °C (0.2 °F)*Changeover between Celsius (°C) and Fahrenheit (°F) Duplex LC Display World Time29 Time Zones (30 cities), City Code Display, Daylight Saving on/off 1/100-Second Stopwatch Measuring Capacity: 9:59'59.99'' Measuring Modes: Elapsed Time, Split Time, 1st-2nd Place Times Countdown Timer Measuring Unit: 1 second Countdown Range: 60 minutes Countdown Start Time Setting Range: 1 to 60 minutes (1-minute increments) Others: Auto-repeat, progress beeper 5 Independent Daily Alarms Hourly Time Signal Battery Power Indicator Power Save Function (automatically disables LCD if the watch is left in the dark for approximately 60 to 70 minutes, and sensor measurements if the watch is left in the dark for six or seven days) Auto-Calendar (to year 2099) 12/24-Hour Format Regular Timekeeping: Hour, minutes, seconds, pm, month, date, day Accuracy: +/-15 seconds per month Approximate battery operating time: 6 months on Rechargeable Battery (Operating period with normal use without exposure to light after full charge) 21.5 months on Rechargeable Battery (Operating period when stored in total darkness with the Power Save function ON after full charge) Size of case/62.3 X 52.2 X 14.2 mm Total weight 117 g