Item Micro USB Male to Stereo 3.5mm Male Car AUX Out Cable Feature Connector 1: Micro B USB Male Plug Connector 2: 90 degree angle 3 pole 3.5mm Male Audio Adapter Function: Sync 3.5mm female AUX Audio Jack to micro USB 5pin male Cable Length: about 30cm Usage Use the 3.5 to micro cable to connect your Samsung i9300 i9220 i9100 with your car CDDVD AUX-IN. then turn ON bottom audio output at your phone (is must) How does the usb to audio cable work go to Settings - Settings of the bottom - the bottom of the audio output (or similar menu) and selected it Note Since Android 5 'Lollipop' many devices won't support music output via USB anymore.