Allows your router to connect the internet around the house using your mains power lines (rather than rely on wifi).
Plug one into a mains socket and attach to your router using an ethernet cable. Plug the others in anywhere in the house that's on the same mains circuit. Connect to a device using an ethernet cable. Simple setup instructions online.
They also have a plug socket on them so you don't "lose" a mains socket.
All working fine when last used.
BT Broadband Extenders x 4 (Heaton Norris SK4)
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