How do I connect the USB-C Dock to my computer?
To connect the USB-C Dock to your computer, plug one end of the USB Type-C cable into the USB Type-C port of your computer. If your computer does not support power delivery through USB Type-C, you will need to use an AC adapter from your computer's supply kit to charge it. (Page 6)
From the official HP Laserjet Pro Mfp M426fdw manual, page 6
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