Its main purpose is to print on specialized photo printer from an Apple device: iOS or macOS
It can be connected to via:
RBA AirPrint's WIFI access point
RBA AirPrint's LAN cable
Optionally, it can be used WIFI Router, but no configuration changes are possible. When the RBA AirPrint is connected to the internet via its cable port, all the devices connected to the RBA AirPrint via WIFI can access to the internet also.