3. Power on and reset:
When this clock is powered on, the LED is fully displayed for 3 seconds, and
the backlight color alternates in the order of red, orange, and white for one cycle.
The initial interface of the system is displayed after a beep sound.
Default display after startup:
white backlight
Time: 0:00
Default time format: 24 hours
Default units: Temperature [°C];
relative humidity: [%]
7