The duplex unit (auto duplexer) is an optional accessory with which you can automatically print on both sides without having to turn the paper automatically. Double-side printing of folded brochures is also possible. Installation is fast and easy: The unit can be attached to the back of the printer in the twinkling of an eye. The duplex unit can remain permanently installed and can be removed quickly if short of space at the printer site. Double-side printing can either be configured on the printer itself (e.g. via copying mode) or via the PC.