Yes. You can purchase new nova units and add them with the following procedure:

(1) Place each new nova unit less than 45 feet from an original nova unit and power them on.

(2) Run the Tenda WiFi App.

(3) If the new nova units are detected, follow the on-screen instructions to add them. Otherwise, tap Settings in the lower-right corner, tap Add Nova, and follow the on-screen instructions to add them.