DeckLink Duo is perfect for developers who need two completely independent capture and playback streams in and out of a computer, or two channels of video in a single card. DeckLink Duo is two independent DeckLink SDI style capture and playback cards in one! There are two SDI inputs, and two SDI outputs plus a common tri-sync/black burst reference. DeckLink Duo appears as two independent SDI cards to the computer, but only uses a single PCI Express slot. DeckLink Duo is perfect for servers where there are multiple streams, or simultaneous capture and playback per system.