SBS TX-Rx Transmitter 3.5mm Jack Black - (TEJACKRXTXBTK)

This 15W car charger allows you to connect your smartphone to the car radio
wirelessly, even where the radio does not support wireless connection. Plug it
into a 12V cigarette lighter socket and pair your phone. Using the integrated
dial, set a radio frequency on the charger and then tune the same frequency on
your car radio. The charger will then be able to connect to the radio using the
FM frequency and all the music broadcast from your smartphone will be played
through your car's speakers.