1This equipment is a simple instrument measuring equipment made for outdoor sports enthusiasts. 2The device is fully functional and can provide information such as altitude, position, air pressure, time, and temperature. 3The device has a wide measurement range and high accuracy, and can provide you with accurate information outdoors. 4The multi-function meter can provide ultra-bright backlight, no matter what the environment, you can clearly see the readings on the LCD display. 5The device is powered by 2 AAA batteries (not included) and has a powersaving function, so you don't have to worry about charging it outdoors. 6The kit is equipped with a rope to make this device more portable in various outdoor sports. Item Type: Multifunction Digital Altimeter Altimeter: Approx. -700~9000m / -2300~29500ft measurement range (the altimeter can be used for initial calibration) Resolution: Approx. 1m / 3.3ft Barometer: 300mbar-1100mbar measuring range Resolution: 0.1mbar Electronic Compass: 8-directional mode display External magnetic field correction Accuracy: 3 Resolution: 1 Thermometer: Measuring range: -10-+60 ( and unit adjustable) Resolution: 0.1 Weather Forecast and Time: Forecast 12 to 24 hours weather conditions 4 types of weather forecasts: Sunny-partly sunny-cloudy-rainy 24-hour time format Electronic Backlight: 5 seconds high-brightness blue LED electronic backlight Battery: 2 x AAA (not included) Accessories: Lanyard, English user manual 1 x Multifunction Digital Altimeter 1 x Lanyard 1 x English User Manual 1. Avoid using it under rain, damp, high or low temperature, etc. (working temperature: 050; storage temperature 2070).2. Avoid contact with corrosive substances such as perfume, alcohol, cleaning agent, etc.3. Avoid using the following areas that may affect the normal direction of the magnetic compass:A. Near buildings such as concrete/steelB. Very close to the power stationC. Very close to household appliances (such as computers, TVs, VCDs, fax machines, speakers, etc.)D. Very close to a bridge made of large amounts of steel or metalE. When the vehicles (cars, trains, airplanes) are moving very closeF. Close to or placed on the surface of the metal plate