The Canon 6D is the first Canon DSLR to offer built-in Wi-Fi, which allows a smartphone or tablet to be paired with the camera to
act as an external remote, viewfinder, photo viewer, and hard drive. If you want to see how the system works, check out this 5-minute video by
Dave Etchells over at Imaging Resource. It’s a short demonstration of the free EOS Remote smartphone app in action by Canon’s Chuck Westfall.