Can someone more fully explain what you can do with this? I assume it's powered through your cars lighter socket, links to your smart phone and transmits to your car's stereo FM. In the past I haven't been to impressed with the transmission quality of such devices but that was years ago. Has technology improved that significantly?

I'd imagine you could take calls and transmit music from your smart phone once linked? What's the purpose of the flash drive? Transmitting stored MP3s? I could hardwire my phone to my auto stereo's AUX socket but I'd rather avoid the wire if the quality will be equivalent?