The power supply according to my measurements no 2.1A. According multimeter I could not over 850mA measure (with 150Ohm resistor in the data line).
I'm going to buy another.
I am well read on various sites with regard to the resistance values and voltages on the data line for certain equipment brands.
For most Android devices, the cable must be short-circuited or connected to a resistor smaller 200Ohm.
In this power supply voltage dividers from the operating voltage to the data lines. This means that there concerns certain voltages.
This type circuit is used my knowledge to Apple. So I am assuming that this power adapter for Apple devices is designed.
No guarantee of accuracy.