A second USB-C port allows for direct broadcast recording to an external hard-drive and simultaneous software control via the computer.
It adds a second HDMI output for more on location presentation options, or secondary monitoring.
Four more HDMI inputs, so now you can switch between eight different camera/video sources at the same time.
What the ATEM Mini Extreme adds over the ATEM Mini Pro: The Blackmagic Design ATEM Mini Extreme and Extreme ISO basically take all the features of the Pro and Pro ISO and double down on their features, while adding a few more quality of life improvements so that true professional streamers have all the tools necessary to break open their production into new heights.