Features 1. Support the format of MP3/WMA&U-DISK 2. Windows compatible file system as removable drives (FAT 12/16/32) 3. Windows98/ME/2000/XP(NO driver procedures are needed above windows 98) 4. No display 5. Rechargeable battery 6. USB 2.0 High Speed interface 7. MLC type NAND flash available 8. Necklace case, touch button.