1. Memory storage from 128MB to 4GB 2. NO display, with Led light 3. Support MP3, WMA format 4. NO FM Function 5. A-B Repeat, reading following, comparison function 6. Can update the firmware and operation system 7. With USB 2.0 port, use as USB storage device 8. Built-in rechargeable Li-ion battery 9. 6 colours available, purple, green, blue, white, red, silver 10. Have got the certificate of CE, FCC.