Boxed version. The Novastar MFN300-B Multifunction box is a multifunction box with a variety of auxiliary functions in compact housing. It can be easily added to the screen setup at any desired position within the ethernet screen connection. The MFN300-B function box allows you to add a variety of functions such as: sensor inputs to connect light or temperature sensors to the screen setup but it also has eight on-board relay contacts, RS 232 connection and audio output.