The SDI Module provides capabilities that enhance ProPresenter's native feature set, but it only works on the Mac version of ProPresenter. If you aren't familiar with what SDI means, it is a professional broadcast quality video interface. The SDI Output module converts the output of ProPresenter to a native SDI stream when used with a compatible Blackmagic Decklink Card or UltraStudio 3D product. While this is an option for those that need an output to an SDI video switcher, our recommendation would be to use a Matrox ConvertDVI or other scan converter downstream of the computer's graphics (DVI/VGA) output.