Unfortunately, the device is not as good as hoped. I use the device in an Opel Vectra Caravan and the lighter front gets the antenna hardly reception. I use the 12V connector at the rear of the reception is a little more stable, but the operation of the transmitter is no longer valid. (Maximum even via Aux - cable and separate media device possible), USB flash drive from SanDisk is detected and running well but I have a feeling that receiving the operation is bad. (VII by less voltage, which is used for the USB stick).
Conclusion: for small cars may not be useful but for Combis with antenna on the rear useful.