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How Many Screens Can I Use With My Mac?
The specifications page for your Mac will explain your video output ports ... and the other one must be using the HDMI port.
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10 Best Dongle For Macbook Air 2019s
USB C to HDMI hub equipped with USB3.0 x2 ... The USB C Hub supports a 100W USB C pass-through charging, ideal for MacBook Pro/Air or and other USB c devices, your primary choice of USB C Hub.