The power adapter with USB output is exactly the same thing also delivered to the mobile phone.
It has a Abschlatung when no charging current is needed and therefore eats less than 0.1 watts what advantage it did not have to constantly pull out of the socket.
Thus I have the charger cable which I use for at home always at the net.
The USB cable is flush with the micro USB (not to be confused with Mini USB !!!) and on the other side with just one USB plug. Data transfer and charging works with the cable without any problems!
The workmanship and quality is very good!
I can only recommend!