Barometer The current barometric pressure is displayed on the screen immediately after powering on. Press the ALTI button to switch between barometer and altimeter.Altimeter The altitude value displayed on the screen after power on is the sea level altitude of the current location. In the altitude display mode, press the SET and ALTITUDE buttons at the same time, you can pressorto change the current altitude value.Relative altimeter The use of the relative altimeter is to clear the altitude value measured at this time and use the position at this time as the 0M altitude, and the altitude value that rises or falls from the 0 altitude is the relative altitude value.To reset the altitude value, press and hold the ALTI button until 0M is displayed at the bottom of the screen, then start moving, and the relative altitude value of the movement will be displayed on the screen. Press and hold the ALTI button again to return to the actual altitude value.Weather Forecast It can predict the weather conditions within 12 to 24 hours when it is turned on, and the effective range is 3050 km.1. Long press the SET button for 2 seconds, 24Hr flashes, press the ALTI button to select between 24Hr or 12Hr2. Press the SET button to enter the time setting, at this time the hour digits will flash, press ALTI orto set the hour value3. Press the SET button to flash the minutes, press ALTI orto set the minutes4. Press the SET button to flash the calendar year number, press the ALTI button orto set the year value5. Press the SET button to flash the calendar month number, press the ALTI button orto set the monthly value6. Press the SET button to flash the calendar date number, press the ALTI button orto set the date value7. Press the SET button to flash the temperature unit Celsius, press the ALTI button to select between Celsius or Fahrenheit8. Press the SET button and the barometric pressure unit flashes, press the ALTI button to select the barometric pressure unit inHgmmHg9. Press the SET button to flash the altitude unit M, press the ALTI button to select between the altitude unit M or FEET10. When the setting is complete, press HISTORY to exit the setting mode, or automatically exit the setting without taking any action within 10 secondscolor Black grayMaterial ABSsize 952cmPackage contents1altimeter barometer1English manual1CR2032 button battery not includedOnly the above package contents, other products are not included.Note Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowable measurement error is13 cm.