Google brought virtual reality to the masses cheaply with Cardboard, a DIY headset announced at last year's I/O conference. Now, the search giant's building upon its 1 million VR viewers with an improved Cardboard headset that fits smartphone screens up to 6 inches. It also incorporates a new top-mounted button that replaces the finicky magnetic ring so that Cardboard works with any phone. And, in what's probably the most consumer-friendly move Google's made with the new and improved Cardboard, it takes just three steps to assemble. Clay Bavor, VP of Product, told I/O attendees that they'd be receiving these new DIY VR kits immediately after the keynote. And for interested VR developers, it's important to note the Cardboard SDK now works with iOS in addition to Android.