It's interesting that they talk abut a supported smartphone. If it was just computer vision looking at what you grab you would only need a printed card with the

It's interesting that they talk abut a supported smartphone. If it was just computer vision looking at what you grab you would only need a printed card with the QR that the folk in the video uses to check-in. So, probably there's something needed from the phone as well: NFC, low energy Bluetooth, inertial location tracking? I guess that we will see when we look at the supported devices list.