The unit charges the iPod when connected and shuts off when the car turns off. The unit returns to the place in the song where you left off when the vehicle is turned on again.
The UK version of the Harman Kardon Drive Play Ipod car connector comes with a wired FM transmitter.
NOTE: Depending on your vehicle model, antenna plug adaptors may be required to connect the Wired FM Adaptor to your radio and antenna.