Then you have to find a frequency that does not work and is not used. Try to find a clear frequency. The thing is not easy when you may have to travel a lot. A quick internet search: select 87.6 and 89.6 in the provinces in Ile de France. I recorded my two favorite frequencies in my car and I basculerai from one to the other by car based on either my presence in Ile de France or province. Too bad the Flexmart not a possibility to record two frequencies to easily switch from one to the other but all this does not matter much, manual configuration is easy.
Then, choose and adjust the Flex Mart on the selected frequency. There are more parasites (you know the cchhhh noise) but silence. Then you can launch your music, it will be posted in your car without difficulty. The Pickup is easily done by pressing the dedicated button. We need the flexmart be close to you because of the button and the microphone. That may be the only problem since driving, this is not always hollowing. However, as the handsfree kits will disappear, there will be no difficulty. My passenger can get to my place, so, so good.
The Flexmart gets into the cigarette lighter and reclining at will, it helps to avoid getting caught in my empty pocket (in my car, the cigarette lighter is not the most ergonomic)
I like the fact that there is nothing to stick in the car (other kits to paste the call button), the fact that there is no wire lying around everywhere (not easy to plug into the cigarette lighter and to have the auxiliary jack everywhere). The only flaw is the FM band setting but if you stick 87.6 or 89.6 as indiqent specialized sites, so you should not need to change too much frequency.