... for MP3 player 128M memory Replaceable battery OEM manufactory RHOS, CE,FCC Promotional Gifts USB sound module/voice chip for MP3 player1. MP3 format audio players ... low voltage, external pin, etc.5. Control mode: MP3 mode, key mode (one-to-one), random play, ... single song loop, all of song loop.7. For NAND-Flash as a storage center, a lot ... Promotional Gifts USB sound module/voice chip for MP3 player