This adapter how it works we uploaded a pic in pics please check before you buy.

 you can't use 3 screen on extended mode at the same time.

Feature:-

*  You need to install driver when you plug this adapter a window can pop up automatically or you have to go to my computer and you can see the drive there open it and install it. For better resolution choose 3.0 USB Port/Blue Port.

* Support 1920x1080 Full HD video output ( USB 3.0 interface is required), and USB 2.0 support 800x600 resolution.

* Super Speed USB 3.0 5GBPS data transfer, output picture smooth and easy.

* Support 4 display mode:- Extension, synchronization, main/sub screen switching and rotation.

* Powered by USB interface, No external power supply needed.

* Support Mac Os, Window 10/8.1/8/7/XP

*  No Linux support at this time.

Package Include:-  one USB to dual HDMI adapter.