Video demonstrating the audio defect in my pair of Eachine EV100
Update: This video was created at the request of Banggood support to try and troubleshoot the issue. I then got this email reply back:
Dear Jared,
For your order ########, thanks for your feedback.
The EV100 is not support audio in RX, so that you cannot hear any sound. the earphone work for AV-in.
So sorry for the inconvenience,