Maybe in your car you have an integrated sound system without Bluetooth ?
So you can't listen music from your phone ?
Now your phone can stream music and phone calls to this small device (by Bluetooth), and this broadcast the sound over a specific radio FM frequency.
So you listen the radio on the right frequency and you are good to go.
With this small device you can :
- Stream music from your phone wirelessly (Bluetooth)
- Answer phone calls, hand free : there is a microphone on the device !
- Charge your phone : the USB plug delivers a 2.0 Ampere current
- Control music / calls / sound volume from the buttons of the device
- Play music from a memory card : there is a micro SD card on the device ! This is nice if you don't want to use your phone.
- Play music from any source, pluged in the line-in plug of the device
And you don't need to charge it, the power is taken from the cigarette lighter socket.