wireless radio transmitter for iPhone
http://www.iphonefmtransmitter.com/music-transmitter-for-iphone-6s-iphone-6s-plus/
Your car FM radio. To find the best station you can just hold down the twisting knob for a few seconds and it automatically finds a clear station for you. All you have to do to put the iPhone FM transmitter into pairing mode is hold the blue call button for a couple seconds, and then the lights start to flash. Then you go into your bluetooth settings on whatever phone you have and search for iPhone FM Transmitter from the list. It usually connects in about 5 seconds. You here two beeps. One thing to notice is that when you want to disconnect one phone and connect a friend's, you have to unpair the 1st phone before connecting the 2nd one.
Sound for Music and Calls:
The sound quality for music seems to be very good. It's way less interference than other FM transmitters, I think it's possibly because there are no wires connecting the phone to the transmitter. Bluetooth music seems to be superior. One thing I did notice was a difference in my sound levels with the bass and treble. I just tweaked the bass and treble levels and got it sounding the way I like. Call quality is different. I can't figure it