... the computer directly and save it in the in-said flash memory, it is used high quality mp3 decoderchip decode MP3 ... file from inside flash memory to audio signal, and transmit them throughFM modulator chips ... memory cardSupport SD cards, Max. to 4GBMemoryBuilt-in 1-4GB flash memory (Optional)FM wireless transmitterBuilt-in transmitter,Transmits the music ...