I just got this radio. It is used and modified.

It has a 3 position switch in the back. I am not sure what are the
frequencies are.

The fuse in the back is a high number. I am not sure if that is the
correct fuse.

The radio can receive without a mic. I need a mic for it. I would like
to get a power hand mic but I am not sure which one will work with this
4 pin radio. I do not want to just buy any 4 pin mic.

The s-meter does not move very much. And I am not sure if the NB button
was modified for something.

Would the Astatic CB Radio 636 Mic work with this? And is the Astatic
CB Radio 636 Mic a power mic?

Thanks, SR