Item No.: ES-121 MP3 Player Description: 1. Mult selective MP3 files playback, 2. A-B repeat Card reader, 3. MMC/SD card slot Seven segment display, 4. Use 1.5V AAA battery, 5. No driver needed above windows 98 Accessories; 6. User manual and warranty card 7. Phone output:5mw+5mw 8. Power consumer:50mw 9. Disk read/write speed:970k bytes/sec,546k bytes/sec