Start time and end time setting value must be among the range of
0:00-23:00,
and setting value can be precise to hour digit.
For example above, click "ON"to use timing silent,
the unit will start the silent at 0:00 points and end at 4:00;
click "OFF" to unuse the timing silent, but if the unit
is in timing silent mode, it will exit silent timing immediately.