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
I was going to get a second one for my 2001 Audi TT because I like this product so well.  But my Audi has a SLA slot that seems to be a little larger than normal so I do not get a secure plug in.  Not the GOgroove's faul.  Audi's fault!  I can definitely recommend this to anyone looking for bluetooth feature in their car.  It was recommended to my by a friend who has tried them all and said this was the best.  He was correct.