The antenna is for the digital transceiver module and it operates in the 868MHz to 923MHz ISM bands.
To learn about the various status displays, including the 'Main' screen shown above, see Status Information.
The LED to the left of the OLED display acts as a colour-coded status indicator.
You can use the control knob to turn the :wave on and off, navigate through menu options, and select options. The control knob acts as a button and a dial.
To turn the :wave on and off, or to select an option in a menu, you should press the end of the control knob. You will hear (and feel) the button inside the control knob press down.
To navigate through the available menus and options and to increase or decrease a value, you should turn the control knob. You can turn the control knob clockwise or anti-clockwise to cycle through the available options or values.