I bought a used Cobra 41 Plus CB, without the manual. The first
pushbutton on it is labeled NB. What exactly is this? I can't tell
that it does anything when it's pushed.

Also, the mic for the 41 Plus is a smaller DIN-type connector with 5
or so small pins. Do they make adaptors which will allow me to
connect a regular 4-pin mic connector to the 41 Plus?

Finally, what is the Dynamike control supposed to do?