Plugable Technologies USB 3.0 to HDMI 4K DisplayLink Video Graphics Adapter for Multiple Monitors up to 3840x2160 Supports Windows, Mac, and ChromeOS

Extend Your Workspace With Plugable’s USB 3.0 to HDMI 4K UHD Video Graphics Adapter
Featuring the DisplayLink DL-5500 graphics chipset, the Plugable UGA-4KHDMI allows you to add additional monitors to virtually any Windows laptop, desktop, or tablet (one adapter required per monitor, up to six on Windows PCs). Multitask with a dedicated monitor for each document or application.
Supports HDMI displays.

Multiple Displays
Connect multiple USB 3.0 display adapters to your computer to expand your screen space by up to six additional 4K (3840x2160) displays.

Boost Productivity
If you're doing information work; looking at one document while editing another, researching, or generally working on several things at once, having multiple displays is indispensable.

Compact and Portable
Easily stows in any backpack or laptop bag, taking up roughly the same space as a pack of playing cards, no external power adapter needed.