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The Phantom4 has the normal usb and the micro usb.
Can both be used tow have 2 displays?
No, but you can use the HDMI output module to hook up a second display.
whats the micro usb on the controller for?
There is no documented use for that port.
If you have an android tablet you can airplay to it from an ipad via a router or ap ( cheap usb powered one)
You need to read this
Screen Mirroring between tablet and laptop