This one is hard to summarize in a headline. This is essentially a computer video card for a second monitor, except that second monitor is a HD display….and the card is a little box that draws the signal and power over the computer’s Thunderbolt bus. Make sense? On our presentation jobs, we sometimes have to find an expeditious way of getting Powerpoint presentations into our HD switcher. This looks like it would do the job for Mac laptops quite nicely.