This device is an ideal minimalist equipment for outdoor sports enthusiasts. For outdoor sports enthusiasts, a wide range of essential and relatively accurate information is available: electronic altimeter (weather forecast + altimeter + with compass + barometer + clock + level + perpetual calendar) blue backlight. < p>8-in-1 Altitude Chart This device is an ideal minimalist equipment for outdoor sports enthusiasts. For outdoor sports enthusiasts, extensive, indispensable and relatively accurate information is available: electronic altimeter (weather forecast + altimeter + with compass + barometer + clock) blue backlight. Size: 90*50*18mm weight: 48g Functions Altimeter: - 700m ~ 9000m (- 2300 ~ 2950ft) measuring range (altimeter can do the correction initial test) resolution 1 meter or 3 feet Barometer: measurement range from 300mbar to 1100mbar 0.1 mbar resolution. Electronic compass: 8 - Azimuth mode display External magnetic field correction accuracy 3 degree resolution 1 degree Thermometer: measurement range - 10 ~ + 60 (the units and are optional) 0.1 degree resolution Weather and hourly forecast: weather forecast after 12-24 hours 4 weather conditions foreshadowing: sunny semi-sunny cloudy rainy 24 hour format Electronic backlight: Electronic LED backlight 5-second high-brightness blue Battery: two seven batteries (without batteries)