HP DeskJet 3521 e-All-in-One Printer Easy wireless printingfrom virtually anywhere. With HP ePrint, now you can print from virtually anywhere. Wirelessly print directly from a smartphone or mobile device, using HP mobile printing applications. Automatically print and copy on both sides of a single page. Easily print, scan, and copy everyday documents, using the 2.0-inch (5.08 cm) mono display.