GOgroove SMARTmini BT ADVANCED Wireless In-Car Bluetooth FM Transmitter with Charging, Music Control and Hands-Free Calling for ANDROID, iPhone, Blackberry and Windows Smartphones
This is a great product.  I had other transmitters before and they were weaker and I heard more static.  This one is strong and clear.  I use it with the bluetooth connection and the 1/8 inch jack, both work great.  I liked it so much I purchased another one for a Christmas gift.