Features:<br />multi-function: digital altimeter comes with digital barometer, weather forecast, time, calendar, thermometer and backlight.<Br />automatically altitude measurement in 2 minutes after the start. It is accompanied by historical altitude pressure records and can store up to 256 records.<Br />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.<Br />predict weather situation: start up to predict the weather conditions in the next 12 to 24 hours, and the effective range is 30~50km.<Br />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.<Br /> <br />specification:<br />material: abs<br />historical altitude record: 256psc record<br />thermometer: celsius / degree fahrenheit format<br />clock: 12-hour or 24-hour format<br />power saving design: start automatic altitude measurement<br />battery: built-in button battery (included)<br />weight: about 100g<br />size: 9 * 5 * 2cm / 3.54 * 1.97 * 0.79In<br /> <br />package list:<br />1 * altimeter barometer<br />1 * instruction manual<br /> <br />remarks: no compass function.