Bluetooth 4.1 FM Transmitter Handsfree Car Kit

This works great for older cars that don’t have bluetooth or hands free capability. Easy setup. I would recommend this product. - TSX

I love the idea of this. It seems like what I’ve been wanting, but will it work if your car have an installed radio/cd player? Meaning not the factory version that originally comes with your vehicle.

What about if your car have an installed CD/Radio player not the factory version?