The new accessory dedicated Wireless File Transmitter WFT-E2 allows wireless transfer and backup, as well as remote control of the camera in Live View mode.
The new transmitter is much smaller and lighter than its predecessor and more affordable as well. The WFT-E2A has many useful capabilities besides wireless transmission of digital photos. In addition to supporting the EOS-1D Mark III and EOS-1Ds Mark III Digital SLR's Remote Live View functions, it can also be connected to various Hi-Speed USB 2.0 external storage devices such as high-capacity hard drives or convenient flash drives with much larger storage capacity than the memory cards in the camera, for instant backup as images are captured.
Whats more, the WFT-E2A can be connected to portable GPS devices to record GPS information (longitude, latitude, altitude, UTC) which is added to file metadata and displayed on the camera's LCD screen below the histogram.