
Tested with both Plantronics and 2.5mm Radio-Shack headset. I have connected it to a Moto G 6 phone as well as an HP Zbook laptop. In all combinations, the speaker sound worked perfectly, but the microphone sound did not come through the adapter. Please note that both headsets I have used are mono headsets and this is a stereo adapter so an incorrect jack may be related to this issue. I haven't done any further electrical research yet as it's not worth the time.

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