TP-LINK TL-PA4015PKIT Pack 2 500Mbps Mini Powerline (1 Ethernet port, integrated socket) (Accessory)
It remains the CPL, therefore incomparable with a network cable, but output is quite correct. The fact that there is a socket is definitely a plus, especially if you use a power strip, it's better to connect the latter to the CPL, rather than pluggin