Four different functions rotate the display clockwise its function as follows: calendar， alarm clock， countdown， temperature 

Gregorian calendar dates for the years 1900 to 2099 a total of 200 years， months， days， weeks 

When rotated to the alarm， the alarm is set to enter the state 

Countdown to a maximum of 99 minutes and 59 seconds， after the completion of the alarm sound 

Temperature with automatic temperature measurement function， range -20 ℃ ~ 50 ℃， choose Celsius and Fahrenheit temperature display temperature display