At one end of the wire is a 3.5 mm Jack plug. On the other end of the wire is presumably a glass LED.

When connected to the phone, nothing happens. The LED does not start to glow.

Also, this wire doesn't work as a microphone. It's also not an earpiece.

What is it for?

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[–] 1 point 2 years ago* (last edited 2 years ago)

Yes but nowadays you'd buy a USB version since few phones have headphone jacks. They're on Amazon.

Here's an old style headphone jack ir blaster adapter:

https://www.ebay.com/itm/404693924792

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