Actually, if a wired connection is not required, one could buy a TP-Link Wi-Fi that serves both rooms. However, any module can be added to the network without any problems. They are all compatible

There are 2 in this kit, each with an Ethernet port. If 2 devices need to be connected, you will need to buy an additional device.

Hello, this kit contains two devices. One is needed to connect the router via LAN cable. The other one is placed in the remote room and can be used to connect your computer to the internet with a cable connection. In other words, with this kit you can connect ONE computer in ONE remote room. For two computers in two different rooms, you need another adapter. If you don't need a wired connection, you can also buy the Wifi version of the TP-Link. This can then connect several computers, but I don't know whether the TP-Link's wifi signal can penetrate walls well. I bought the TP-Link because my employer's VPN connection via wifi kept dropping out, but now it's stable with a wired connection. However, the speed is a lot slower than my internet subscription would allow.