The Nikon Camera Control Pro 2 Upgrade is a discounted UPGRADE ONLY version that is identical to the Camera Control Pro 2 Full version. It requires a valid serial number from Camera Control Pro version 1.0~1.3. Users without this number will not be able to use this software and must purchase the Camera Control Pro 2 full version. Camera Control Pro 2 lets you take control of your photography-remotely, using the included USB or Firewire cable and/or optional WiFi adapters for select models. Compatible with all D-series SLR models, Camera Control Pro 2 duplicates many of your camera functions right on your computers screen. A simulated (camera) LCD panel on the computer screen performs the same function as the cameras viewfinder display. LiveView allows live previews direct from the camera and is supported in software for the D3 and D300 cameras. Camera Control Pro 2 is available for the D3, D2Xs, D2X, D2Hs, D2H, D300, D200, D100, D80, D70s, D70, D50, D40X, D40, D1X, D1H and D1 digital SLR cameras. Specific Compatibility Information for Mac OS X and Windows Operating Systems as well as system requirements are not yet available and will be released soon.