pizarra 1. Long press the [SET] button for 2 seconds, 24Hr flashes, press the [ALTI/+] button to switch between 24Hr or 12Hr2. Press the [SET] button to enter the time setting, at this time the hour digits flash, press [ALTI/+] or [-] to set the hour value3. Press the [SET] button to flash the minutes, press [ALTI/+] or [-] to set the minutes4. Press the [SET] button to flash the calendar year number, press the [ALTI/+] or [-] button to set the year value5. Press [SET] button to flash the calendar month number, press [ALTI/+] or [-] button to set the month value6. Press the [SET] button to flash the calendar date number, press the [ALTI/+] or [-] button to set the date value7. Press the [SET] button to flash the temperature unit Celsius, press the [ALTI/+] button to switch between Celsius or Fahrenheit8. Press the [SET] button and the air pressure unit flashes, press the [ALTI/+] button to switch to the air pressure unit /inHg/mmHg9. Press the [SET] button to flash the height unit M, press the [ALTI/+] button to switch between the height unit M or FEET10. After the setting is completed, press [HISTORY] to exit the setting state, or automatically exit the setting without doing any operation within 10 secondscolour:Black greyMaterial:ABSsize:9 x 5 x 2cm Contents:1 x altimeter barometer1 x English manual1 x CR2032 button battery (not included)Only the above content, other are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.