Image Video Quad Multiviewer/Switcher. Has the ability to switch between 4 SDI inputs or display all 4 at once in a quad multi view. Has audio metering and tally support. Accepts signals up to 1080i 60hz. Outputs via DVI.
PWR supply not included. They take 5V DC power with the regular pin style jack.
These guys seem rather undocumented on the internet, so if you have any questions don't be afraid to ask!