They arrived and I set them up. Good news - they came with Duracells! 2 AA's with each mic! The mics seem solid: metal bodies. Sounds like a cheap dynamic but is usable.
As for the rest...I do hear a little noise. Probably not anything gen public would notice. Fixed freq and as someone pointed out, the display is stenciled on. No idea what freq it's operating on and I don't have the equipment to check. The receiver has 2 antennas, though I highly doubt it's diversity and 2 outputs both of which are labelled Mic 1&2. Even came with a short 1/4" cable and 2 mic clips.
So it works and it's dirt cheap. I'm just glad that I don't have to hear them.