Features: 1. USB 2.0 interface 2. Support the format of MP3/wma&u-disk 3. Windows compatible file system as removable drives (fat 12/16/32) 4. Windows98/me/2000/xp(no driver procedures are needed above windows 98) 5. Without display 6. Built-in rechargeable 150m a/h li-battery 7. Football shape Specifications: 1. Size:35 mm diameter 2. Weight: About 12 grams (player body with battery) 3. Power: Li- battery 150m a/h 4. Data transferring interface: USB 2.0 full speed 5. Storage media: On-board flash memory (32/64/128/256mb/512m/1gmb) 6. Bit rates: MP3 format 8~320kbps WMA format 5~192kbps 7. S/n ratio:90db 8. Earphone o/p:50mw 9. Frequency response:20hz~20khz