... specialized in R&D,manufacturing of multi-function card headset.headset sports wireless mp3 player,building 15 engineers R&D team including ... -10 hours of practical time Technical specificationsItemSpecificationSupport Memory Card MMC card,SD card,TFcard(SD card adapter required),minMusic formatMP3,WMASupport the maximum memory ... 7. Inner box siz,125*9*125 mm. muli-function card headset mp3 player