Power adapter is working. It is very light compared to the original one for Raspberry pi zero. It is good for the price I paid but I would not use it for anything serious. At least not for anything requiring 3A...
Power adapter cannot deliver 3A output.. At 3A load this power adapter provides 4,17V and 2,67A. During my tests this was a maximum it could offer :) Output voltage drops down to 4,17 volts and the max output current was 2,67A.. It is definitely not a 3A adapter as stated in the description.. It's not bad for a few dollars but it's description is misleading..
Thanks, all right!