FM transmitter for cars with no AUX
If your car does not have AUX-IN function, then you need this item to make the sound come out from car speakers.
How to use:
1. Connect the FM transmitter box to audio out of navigation system and power wires.
2. Setup the frequency on FM transmitter box, for example 87.7MHZ
3. Adjust the FM on your car to the same frequency.