Found it: http://www.mecbatec.com/Documents/TG_2506B.pdf
E138681: LEAD YEAR ENTERPRISE CO LTD
The 12v rail at an peak of 10A so... it can probably do only 9A continuous.
Looking combined power for 3.3 and 5V tells how this maker rates their junks and it looks entirely similar to these:
But at least it shouldn't electrocute user because it has managed to get Nordic safety approval certificates...