It's mainly for the Surface Pro 4 and below.
This is meant for the older Surface Pros (4 and below), it works on 12V instead of 15V, so it won't charge the Surface Pro 5+. For the Surface Pro 9, does work for USB and display out if you connect it to a powered hub; it needs to have its own power that isn't just pass through.
I tried forcing 15V to it, but it still doesn't charge the Surface Pro 9; the adapter didn't die even though I did this.
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