What exactly is this thing? Description says USB to HDMI Adapter - External Video Card; product shows the HDMI as the *INPUT* and suggests it is a capture card and not a display adapter. Anyone wanna venture a guess??

The description on this site is a lie. It is an HDMI->USB adapter, intended for video capture. It does not act as a display adapter.

Questions & Answers: USB 2.0 / 3.0 to HDMI Adapter - External Video Graphics Card for Multiple Monitors 2048 X 1152/1920 X 1080 (Compatible for Windows 10 / 8.1 / 8/7)

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USB 2.0 / 3.0 to HDMI Adapter - External Video Graphics Card for Multiple Monitors 2048 X 1152/1920 X 1080 (Compatible for Windows 10 / 8.1 / 8/7)

Connect an HDM display via this slim USB 3.0 adapter for an ideal multi-monitor solution for your Ultrabook or laptop
Backward compatible with USB 2.0; Works with PC; USB powered - no external power adapter required
Increase productivity by running multiple applications on different screens - check your email on one screen and search the web on the other. USB Video / Multi Monitor Adapter / USB Video Card / USB to Video / USB to HDMI Adapter Converter
It supports 5.1 channel audio and supports video resolutions up to 1920x1080p. Supports 1080p video resolutions
Notes: This USB video adapter uses a DisplayLink family chipset. If you are connecting this device to a computer in conjunction with additional USB video adapters or docking stations, avoid using devices with a Trigger or Fresco family of chipsets. And it is not designed