Mercurius is a scalable 5G WiFi router with multiple modules. It is designed to meet the wired and wireless connectivity needs of smart and conventional homes. It contains three modules: a WiFi module, an IoT module, and a mobile access Femto module. Users can choose modules to expand the functionality of the router, depending on their needs. Users who have the need for a smart home can just set up the IoT module. For users who want to achieve the real 5G mobile network environment, just add an NR radio module, then unplug the network cable and enjoy a real wireless network.