Quick overview from the supplier:
TP-Link Wireless Powerline Extender, TL-WPA4220KIT, 300Mbps
// One Touch Super Range Extension - Wi-Fi Clone Button simplifies your Wi-Fi configuration and helps build a seamless unified home network
HomePlug AV standard providing up to 600Mbps1 high speed data transmission over a home’s existing electrical wiring, ideal for lag-free HD or 3D video streaming and online gaming
Extend 300Mbps wireless connections to previously hard-to-reach areas of your home and office
