Printrex 812 thermal printer.
This item has never been used (or even taken out of the box!), so we assume that it is ready for use.
It runs on a 12v or 24v supply and is intended for use in a vehicle - for printing out maps, plans etc whilst on the move, but it can also be used for printing out invoices in a retail outlet.
Full details can be found on the internet.
I will try to answer any other questions but my knowledge is limited.