What are the different ports used for ?

There are 5 ports behind your device:

12V1A : It is where you plug the power cable.
Reset: Used to reset your device to its factory settings by inserting a paper clip in it.
WPS: The WPS button is used to pair different devices together.
WAN: The WAN port for a RJ45 cable to connect it to your internet box.
LAN: It is used to connect one of your personal device to the Mesh via RJ45 to ensure a constant connexion.