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BT ethernet extenders

I own an ethernet extender kit which has two devices connected to mains. Its data sheet claims that the device "your homes electrical wiring to extend your broadband network anywhere in the house". An informative youtube video also suggests that the data is transferred from your mains.

The little I know about 3 pin power sockets makes me think that this is impossible. I strongly suspect that both devices have receivers and transmitters within them that transmit the data. Is there any way I can prove/disprove this?

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    $\begingroup$ What exactly do you think that's impossible? What is it that you want to disprove? $\endgroup$
    – NMech ♦
    Jan 6, 2021 at 17:22
  • $\begingroup$ Data transmission over mains has been a thing for > 40 years. $\endgroup$
    – Transistor
    Jan 6, 2021 at 17:23
  • $\begingroup$ Look up Power-line communication on wikipedia en.wikipedia.org/wiki/Power-line_communication $\endgroup$
    – OpticalResonator
    Jan 6, 2021 at 17:23
  • $\begingroup$ Power line communication is proof that data can be transmitted through mains. Thanks $\endgroup$
    – Krish
    Jan 6, 2021 at 17:34
  • $\begingroup$ @NMech I thought it was impossible to transmit data over mains; Three pin sockets have AC which seems difficult to transmit data through $\endgroup$
    – Krish
    Jan 6, 2021 at 17:39

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Is there any way I can prove/disprove this?

Yes. Run an extension lead from your neighbour's house to power one of the devices. It should fail due to either distance or your neighbour being on a different phase of the mains.

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