Time setting: long press the "TIME" button for two seconds, the specific process
is shown in the following table:
Note:
1) The week changes with the year, month and day;
2) The annual setting range is 2020~2099;
3) The second returns to zero when the minute is set;
4) Single press the "TIME" key to confirm the setting result and move to the next
setting item;
5) Single press the "▲/RF" key to set the item one step forward; long press for
more than 2 seconds, it will advance at the speed of 8 steps per second;
6) Single press the "▼/MEM" key to go back one step of the setting item; long
press for more than 2 seconds, it will go back at 8 steps per second;
7) No operation within 20 seconds will save the settings and exit the setting
mode;