Support for external signal switch directly - Support bluetooth V3.0 + EDR - Support USB / SD / Bluetooth / FM / LINE switch automatically - Module containing MP3/WMA decoder chip - Support USB SD MMC card for playback - Support USB / SD card switch: last next fast forward rewind adjust volume EQ play / pause stop single repeat mute shutdown elections songs - Support bluetooth last song next song adjust volume EQ play / pause mute shutdown - Support FAT16 FAT32 file system - Support MP1 Layer3 MP2 Layer3 MP3 Layer3 versions of songs - Support for 32~320kbps MP3 songs - Support power and memory function: remember the music and volume before power off - Output voltage: 12V