This means not only it prints duplex in an automatic regime, but also supports two-sided originals during scanning or when copying. For me it's important, I often scans lecture notes or handwritten corrections of texts to send to my students, and for me it was always a scanner breaks foot of multipage documents with my old printer all-in HP; Fortunately she broke down and bought the Canon Pixma MX925. In fact it's the only one I found on the web whose pub says it explicitly supports two-sided A4 documents in automatic mode, and that's why I bought it.
Moreover, it is easy to install; I made wireless by print tests on Windows 8, Snow Leopard and iPad iOS 6. And when scanning, it can send the file to a computer via wifi, or save to an external USB drive connected without its prior 'No computer is on.
