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"The Xebec Tri-Screen 2
Best for: Turning your laptop into a three-screen powerhouse.
The Xebec Tri-Screen 2 uses a mounting frame to attach two slide-out 10.1-inch displays to the back of your laptop’s existing screen. Each Xebec display slides out from behind your laptop—one on each side of your laptop’s display—thus creating a highly portable three-display work area. Installing these two monitors and its bracket requires the supplied frame clamps, but nothing extra, like magnets or glue.
Each 16:10 aspect ratio display measures 6.5 millimeters thick, with 1920 x 1200 resolution at 60-hertz refresh rate. And each monitor can rotate 180 degrees. This setup is compatible with all Windows PCs, Macs and ChromeOS-based computers, yet it only adds two pounds to what you need to carry around."