My car's entertainment system is only able to play audio CDs and receive AM/FM radio. I am thinking of getting a Bluetooth FM transmitter so that I could use my car's speakers to play my smartphone's music and make hands-free calls.
It is my understanding that the Bluetooth connection between my phone and Bluetooth FM transmitter is encrypted. However, the FM radio transmission between the Bluetooth FM transmitter and my car's FM radio receiver seems to be unencrypted. Does this mean that anyone within range of the FM transmission will be able to listen to my hands-free calls? Does this mean that I must not talk about sensitive topics (e.g. banking, medical, etc.) when making hands-free calls through the Bluetooth FM transmitter?