Connecting the Cables
Plug all the cable into the GAOMON tablet and your computer tightly (You can refer to the instruction in the package box)
Power on the GAOMON Pen display and note the following:
Windows
Simultaneously press the ‘windows’ + ‘P’ key on your keyboard and choose the ‘Duplicate Mode’
Desktop computer
When you are using a desktop computer, make sure the HDMI cable is plugged in.
Laptop computer
You will need a DP to female HDMI converter, shown as below.
Mac
When you are using a Mac laptop, take MacBook Air as an example. You can use a Thunderbolt to HDMI adapter.
https://www.manualslib.com/manual/2767266/Gaomon-Pd1161.html
(USB to HDMI and Hub multi-interface adapters are not recommended)