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Excuse me, has anyone heard of: permanent free network card? One is from Taiwan Province Province! Radar antennas are used to share networks by searching the surrounding networks.
A device called a rubbing network card.

It means searching for available wireless networks near you and amplifying the wireless signal so that you can use it.

Some devices require a password-free wireless network.

And some can automatically crack the password.

Your local information city should sell it, but you'd better buy it yourself.