How to adjust the alarm clock of Hua Hong electronic perpetual calendar?

①8 groups of alarms (determined by key options).

Default value is invalid. The default time is 12: 00.

② Alarm clock setting:

In the normal time state (or the day counting state), press the "alarm setting" key to enter the "alarm setting inquiry state", the alarm setting indicator lights up, the temperature position shows "A 1", indicating that you are currently viewing the information of "1 group alarm setting", and the hour and minute positions show "-:-",indicating that it is displayed. Press the "Up" button to switch between "valid" and "invalid", press the "Set" button to enter the alarm clock time setting, and the hour position flashes. Press the "Up" or "Down" button to modify the content of the blinking position, and press the "Set" button to move the blinking position to the minute position.