What’s this spare cable that came with my new TV?

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Any Idea's - LG C3, no instructions came with it. Seems to work without it plugged in anywhere.

IMG_0321.jpeg
 
Infra red extender wire.
Extends the IR from your remote, by repeating the IR signal from your remote into say a closed cupboard.
Where you might hide say a DVD player.

I have mine stuck on inside of close cupboard door so all DVD player and other kit can see it at same time, or tape it directly onto DVD player next to its IR window.
 
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