Amazon.com : Tera 1D 2D QR Barcode Scanner Wireless and Wired with Battery Level Indicator Digital Printed Bar Codes Reader with Stand Portable Handheld Barcode Scanner Compact Plug and Play Model D5100-Z :
Steam Support :: Steam Guard: How to set up a Steam Guard Mobile Authenticator
Steam mobile app update brings a new UI, sign in with QR code - gHacks Tech News
Valve releases redesigned Steam mobile app with QR code login | Engadget