Working voltage: - Output power: 2 x 3W - Length middle hole distance: 68mm - Width middle hole distance: 17mm - Supports external signal direct switch - Supports Bluetooth v3.0 + EDR - Supports USB / SD / Bluetooth / FM / LINE auto switch - Built-in MP3 / WMA music decoder chip - Supports USB flash drive / SD / MMC card to play - Supports USB / SD switch next / previous song forward / backward volume adjustment EQ play / pause stop single song repeat mute power off direct selection of music - Supports Bluetooth last / previous song volume adjustment EQ play / pause mute power off - Supports FAT16 and FAT32 file system - Supports MP1 Layer3 MP2 Layer3 MP3 Layer3 versions - Supports 32~320Kbps MP3 song - Supports power off memory function - Supports SD card up to 32GB - FM frequency: 87.5~108MHz