1,8 in 1 Functions: Contains digital altimeter, digital barometer, digital compass, weather forecast, time, calendar, thermometer and backlight. 2,Altimeter and Compass: Altimeter range: -2296 to 29500 feet, can record 256 historical altitudes; compass shows bearing in degrees and cardinal points. 3,Thermometer and Clock: Thermometer is freely switchable in Celsius, Fahrenheit format; Clock in 12‑hour or 24‑hour format. Backlight is provided for you whenever you press any button. 4,High Accuracy: The digital compass is based on electronic orientation sensor and air pressure sensor technology for precise measurement. 5,Outdoor Use: The digital altimeter is designed for outdoor use, and the detachable lanyard makes the digital compass the perfect handheld device for all kinds of outdoor activities. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.