Works great. I bought another similar unit that appeared not ...

Works great. I bought another similar unit that appeared not need an additional power source, but it didn't work. 4 stars only because of the need for the additional power source, which adds more wires to my already crowded workstation. Other than that, works just fine connecting my 2017 Macbook Pro to a monitor. (through a usb-c hub with HDMI output)

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