ITEM NAME:12V Bluetooth 4.2 Car MP3 WMA / WAV Audio Module USB SD FM TF Radio KXC.MODE: TF card and U disk: switching sequence for USB→TF→Bluetooth→FM→AUX;Only U disk: switching sequence for USB→Bluetooth→FM→AUX;Only the TF card: switching sequence for TF→Bluetooth→FM→AUX;There is no USB and TF card: switching sequence for FM→AUX→Bluetooth.
