I need a simple low latency wireless audio link and got these boards quite cheaply from Aliexpress, advertised under the name in my subject line.

Par for the course, they come with absolutely minimum data, but seem to work quite nicely with the onboard microphone. I wonder if anyone round here has tried them.
Two connections below and left of the onboard mic on the trasmitter are marked MIC- and MIC+ but there is no info on how to use them for an external microphone, which I'd like to experiment with. There is no bias voltage on them for an electret mic and no indication how to disable the onboard mic. The 4 adjacent through-plated holes might be implicated, but since the receiver has 4 similar holes I suspect they may be for firmware update. In fact, two of hem are Vcc and Gnd, rather suggesting that is the case.
Any thoughts anyone?

Par for the course, they come with absolutely minimum data, but seem to work quite nicely with the onboard microphone. I wonder if anyone round here has tried them.
Two connections below and left of the onboard mic on the trasmitter are marked MIC- and MIC+ but there is no info on how to use them for an external microphone, which I'd like to experiment with. There is no bias voltage on them for an electret mic and no indication how to disable the onboard mic. The 4 adjacent through-plated holes might be implicated, but since the receiver has 4 similar holes I suspect they may be for firmware update. In fact, two of hem are Vcc and Gnd, rather suggesting that is the case.
Any thoughts anyone?
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