Powerline adapters extend your WIRED connection anywhere in your house that has an electrical outlet. It comes in pairs. One is plugged in to the wall beside your main router connected together by ethernet cable. And the other adapter can be plugged anywhere you want a wired stable internet connection like gaming console. You can also connect a wireless router to the other end to eliminate dead spots or to have strong signal anywhere around your home. I have 4 of them in different rooms and one has a built-in wireless router.
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