... is specialized in R&D,manufacturing of multi-function card headset.headset sports wireless mp3 player,building 15 ... and write files to the MMC / SD card, Function for the card reader4.3.5mm audio output universal ports, MP3 ... hours of practical time Technical specificationsItemSpecificationSupport Memory Card MMC card,SD card,TFcard(SD card adapter required),minMusic formatMP3,WMASupport the maximum ...