A:Answer The Orbi is a router and creates a “WiFi mesh”. It is not a WiFi booster. If you live in an apartment, or small house, you could probably get by with just the router (RBR20), as it covers up to 2000 sq ft. I have the RBK50, (router and satellite) and it covers up to 5000 sq ft. If you have an ISP’s modem or modem/router combo, the Orbi will connect to the ISP’s device via the supplied Ethernet cable.