Hi, I believe it means "E" electronic switching and
"R" for relay switching.
73

K7LTF Zach wrote:

I have a D104 that i am trying to wire up, and I need to know what the
E & R indications that are labeled on the switch of the mic stand for.

This is the one that has the amplifacation option in it. I want to
wire it to an 8 pin Kenwood TS 850.

Thanks Zach