Specifications: Barometer: measuring range from 300 mbar to 1100 mbar, resolution 0.1 mbar. Electronic compass: 8-azimuth display, external magnetic field correction: accuracy 3, resolution 1 degree Thermometer: range from -10 measure +60( and optional units), 0.1 degree resolution For outdoor sports enthusiasts: Provide a wide range of necessary and accurate information, suitable for outdoor places such as mountaineering, camping, mountaineering, etc. Weather and Time Forecast: 12-24 hours in advance to predict the weather conditions, 4 types of weather conditions: sunny, semi-clear, cloudy, rainy 8 in 1 multifunctional altimeter: Electronic altimeter (weather forecast + altimeter + compass + barometer + clock + spirit level + calendar), 5 seconds high brightness blue LED backlight Altimeter range: The measurement range is -700 m to 9000 m (-2300 to 2950 feet) (the altimeter can be calibrated initially), with a resolution of 1 meter or 3 feet