With this FM transmitter I have now found a great solution for me. Previously, I had to always think about the SD card for my transmitter with to take out of the car and up the latest songs to copy (eg. For my children) in order to then have to. This transmitter makes it a lot easier because I now simply my smartphone which I so why as Navi always use this and have there are always all MP3s on top of me.
The connection to the smartphone works incredibly easy and the connection is stable. The FM transmitter is very good, and sends a clear signal to the car so that I can hear the MP3s well.
The car plug has the same charge and a USB output to the smartphone so. The built-in speakerphone has a good microphone and sends the signal from the opposite equal to the car radio. This solution works great and my interlocutor has everything well understood.
For me the perfect solution for a not entirely perfect situation.