Tunes2Go Bluetooth Handsfree Car Kit/FM Transmitter (Black) Hands free talk via high quality built-in stereo microphone Wirelessly transmit phone calls from any Bluetooth-Enabled Phone to the car FM stereo system Switch to Hands-free mode automatically from music playing mode when receiving calls Transmit music from any portable music players - MP3 Player, CD/DVD Players or iPod USB and Micro SD Reader directly plays MP3 music from USB flash drive and Micro SD card