TP Link Wi-fi extender (Pen-y-stryt LL11)

This isn't the best wi-fi extender but it works. It uses the mains cabling in the house. You plug it into the mains near your router with a signal cable between the two then you plug the other part into any room in the house, with a signal cable between it and your computer. I've had it for years and it works but I recently had a mad moment and bought a bigger and better one at much greater cost.