Specification: 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 Package List: 1 x Multifunction Digital Altimeter1 x Lanyard 1 x English User Manual Note: 1. Avoid using it under rain, damp, high or low temperature, etc. (working temperature: 0℃‑50℃; storage temperature ‑20℃‑70℃). 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/steel B. Very close to the power station C. 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 metal E. When the vehicles (cars, trains, airplanes) are moving very close F. Close to or placed on the surface of the metal plate