This product is for outdoor sports enthusiasts to product the ideal type of simple equiment, The use of green solar-powered battery with a waterproof function, Solar-powered products to solve the power problem,as well as the environmental pollution caused by discarded batteries,For outdoor sports enthusiasts to provide a wide range of need, as well as the relatively accurate information, such as: altimeter, barometer, temperature, compass, time and weather forecast! * Solar power: Low light amorphous silicon solar cells * -2296 feets to 29500 fts range * 300mbar to 1100mbar range * Resolution of 1mbar * Sea level pressure manual setting * The weather forecast for next 12 to 24 hours * 4 weather status indication, sunny-cloudy-overcast-rain * 4-bearing mode display * Extermal magnetic field calibration * High accuracy of "+" or "-" 3 degrees * Thermometer -10 to +60 degree C ("C of "F selectable) * Resolution of 1 degree * Time with hour, minute, second * 24 hours format clock display * Size: 73mm x 57mm x 17mm Package Contents: 1x Solar Power Multifunctional Digital Altimeter 1x Strap 1x User manual