Features: Multi-function: Digital altimeter comes with digital barometer, weather forecast, time, calendar, thermometer and backlight. Automatically altitude measurement in 2 minutes after the start. It is accompanied by historical altitude pressure records and can store up to 256 records. Altimeter: -700 meters ~ 9000 meters (-2300 ~ 2950 feet) measurement range (altimeter can be used for the first test correction.). 1 meter or 3 feet resolution. Predict Weather Situation: Start up to predict the weather conditions in the next 12 to 24 hours, and the effective range is 30~50KM. Altimeter Barometer: Designed for outdoor use, and it is the perfect equipment for a variety of outdoor activities. Can be hung on a backpack, belt for easy carrying, when you press any button at any time, it will provide you with backlight. Specification: Material: ABS Historical altitude record: 256PSC record Thermometer: Celsius / Degree Fahrenheit format Clock: 12-hour or 24-hour format Power saving design: Start automatic altitude measurement Battery: Built-in button battery (included) Weight: About 100g Size: 9 * 5 * 2cm / 3.54 * 1.97 * 0.79in Package List: 1 * AltimeterBarometer 1 * Instruction Manual Remarks: No compass function.