The Casio SGW400HD 1BV is a high quality sports look backed by a rich feature set. The watch takes and displays barometric pressure readings, which are then converted into Altitude Measurements based on International Standard Atmospheric Values. A built in thermo sensor gives reliable temperature readings. Combining these sensors with a rugged case design, analog digital display and a host of additional features makes this watch tough to beat. Altimeter Measuring Range: 700 to 10,000m 2,300 to 32,800ft Measuring Unit: 5m 20ft Barometer Display Range: 260 to 1,100 hPa 7.65 to 32.45 inHg Display Unit: 1 hPa 0.05 inHg Barometric Pressure Differential Pointer Thermometer Display Range: 10 to 60 C 14 to 140 F Display unit: 0.1 C 0.2 F 100M Water Resistant Low Temperature Resistant 10 C 14 F EL Backlight with Afterglow 5 Daily Alarms Hourly Time Signal World Time 31 Time Zones 48 Cities, City Code Display, Daylight Saving OnOff 1100 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: 1 Minute to 24 Hours 1 minute Increments and 1 hour Increments Full Auto calendar Pre programmed until the year 2099 1224 Hour Formats Water resistant to 100m.