Unfortunately, the reality was different. When the package arrived, two units of "OTB" were included, and not as described by "mumbi". The product picture also did not correspond to reality.
The units possessed a charging current of 500mA, which could have my old appliance also - unfortunately this charging current for modern smartphone insufficient.
The dealer contact was positive. I got my purchase amount refunded without hesitation. Unfortunately, I could not remedy offered. I therefore assume that the device described here is no longer available.