Impressively, it prints on both sides of a page automatically it just waits a couple of seconds for the ink to dry before taking the paper back in. Paper is fed through the front (it has a 100-page input tray) and travels along a curved path to re-emerge at the front (up to 30 pages can rest on the output-tray extension). Physically, the Envy 4500 is a small printer that looks stylish on a desktop thanks to a slim profile and the lack of 'wings'. HP AirPrint is for Apple devices, and HP ePrint for Android devices. Furthermore, you can print from mobile devices as long as you have the appropriate app installed. It's one of the Envy printer models that can harness HP's ePrint service, which can be used in a couple of ways: you can either email documents to the printer, which it will then print, or you can connect it to the Google Cloud Print service and print documents from there.
