GROM Audio BTD,BMWSU3 (bmwsu3_btd) Control Your Streaming Music
GROM BMW MST4 3-series E90 2007 2008 2009 2010 USB Bluetooth Adapter Interface Kit Installation - YouTube
Grom Audio Digital Interfaces | eBay Stores
Installation of GROM USB Android iPhone Bluetooth Car Kit Into BMW Z4 2003-2008 (trunk) - YouTube
Performance MP3 > Mini Cooper 2006-2010 (R56; Must have MP3/CD Changer capability) > GROM-MST4 Android iPhone for BMW Optical Fiber, Bluetooth optional