RF generators also called RFA machines, Lesion generators, radiofrequency generators, pain management generators, and several other names come in single-channel, three-channel, and four-channel models. I get a lot of questions on the terminology used if you can't tell from the length of the prior sentence:) The number of channels is also the number of RF electrodes that you can use at the same time.
I have been working with radiofrequency generators and pain management equipment in general since 1992 and I have never seen a two-channel RFA generator. If any of you know of one let me know.