The adapter is working properly. But you have to be aware (what some reviewer did not do here apparently) that the Micro plugs USB micro A for a USB Micro output (!) Socket is intended. Thus, the well does not fit into a smartphone or similar, and if they do (by force?), Then it can not work because these jacks on Smartphone input (!) Are jacks. Clearly there is also the fact that the adapter at the other end a USB A socket (female) has, so just like the sockets in the PC o. Ä. So please ignore the negative reviews that complain that the adapter does not fit or . does not work.
