The Sonnet Echo Express I is an external PCIe housing with a Thunderbolt 3 connector. Once you've installed the Blackmagic Decklink Duo 2 in the case and connected it to your computer, all you have to do is install the Blackmagic drivers and you're good to go! With 4 independent 3G-SDI connections, DeckLink Duo 2 is a PCIe capture and playback card that supports SDI formats in SD and HD up to 1080p60! You get the flexibility of 4 separate recording or playback cards in one! Plus, it's fully customizable, making it perfect for media playback systems, real-time multichannel capture systems, and more!