Solar Powered Multifunctional Sports Digital Altimeter (Barometer, Thermometer, Compass, Weather Forecast, Time) Solar Power: Low light amorphous silicon solar cells, 7uA at 200 Lus Altimeter: Range of -2.296 feet to 29500 ft, Accuracy of 1 m or 3 ft Barometer: Range of 300 mbar to 1100 mbar, Accuracy of 1 mbar, Sea level pressure setting manual Electronic compass: 4-bearing mode display, External Magnetic field calibration, High Accuracy of + 3degrees Thermometer: Range of -10C(14F) to +60C(140F) (C and F selectable)