The PDF manual states...
"This DVD recorder can only play DVD-Video discs
marked with the same region code as printed on its
rear panel (example of region code: ie:2), or all-region
discs which are labeled with the icon ALL . If you try to play discs with different region code(s), a message saying ‘Invalid Region Code’ will appear on screen."
As Amazon are advertising it as region free it should be, have you tried it and got the error?
BTW, the Manual can be found at click here