What size does the power plug of the UBook X have?

I want to operate my device with a power pack, but I don’t want to waste an OSB-C port for it - there are now USB-C 12 V power plug adapters in different sizes and I would like to know which one fits.

I hope this info is suitable
“Model Charger:1
Input:100-240V 50/60hz 0.7A
Output:12V 2A”

The connector:
Outer diameter 3.5mm
inner diameter 1.35mm
head length 10mm adapter
cable length 1.8M

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