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
It worked a total of one day.  Then it stopped powering on.  Tried it in another car's outlet.  Still didn't work.  Followed manufacturers troubleshooting guidelines.  Nope, no luck.  Returned.