18 Functions: The altimeter can also be used as a digital barometer, digital compass, weather forecast, time, calendar, thermometer and backlight. 2Perfect Outdoor Equipment: The digital altimeter is designed for outdoor use and the detachable cord makes the digital compass the perfect handheld device for all kinds of outdoor activities, it will provide you with backlighting when you press any button at any time. 3Portable and Easy to Use: The altimeter is designed to be portable and easy to use, making it a perfect companion for outdoor adventures. It is compact enough to be carried in your pocket, and the large, easy to read display makes it simple to use, even in low light conditions. 4Compass Function: The compass function on this device provides you with an accurate reading of magnetic north, helping you navigate through the great outdoors with ease. This feature is particularly useful for hikers, hunters, and other outdoor enthusiasts who rely on accurate directions to navigate through the wilderness. 5Individual Function Role: Thermometer in Celsius, Fahrenheit format. Clock in 12-hour or 24-hour format. Calendar with backlight. Altimeter from -2296FTS to 29500FTS. Weather forecast display. Historical altitude record is 256 records. Compass is in degrees and base point to show bearing.