Faulty ...

The copy I received was defective: completely unstable voltage (verified voltmeter). The wifi router he had power would not start while with another 12V power supply it starts without complaint.
Fortunately, Amazon returns policy is perfect: reimbursed without question and return costs borne by Amazon.

Complement: a few days after posting this comment on Amazon, I received an email provider (not Amazon) apologizing for the problem I have found and asking me to edit my review and revise the note rising.
I find these pitiful and dishonest methods. The alim I received was defective, unusable; I think it is important that other potential buyers have this information, they will do what they want (there was also satisfied buyers-apparently) - it's made in China, with quality requirements does not seem very high, which leads to put on the best market that do not work; important to know before you buy.