1. Size:42 x 14 x 7mm 2. Weight: About 18 grams (player body with battery) 3. Power: Rechargeable battery 4. Data transferring interface: USB 2.0 High Speed 5. Storage media: on-board flash memory (128M/256M/512M/1G/2G/4G) 6. Bit rates: MP3 format 8~320kbps WMA format 32~384kbps 7. S/N ratio: 90dB 8. Earphone O/P: 50mW Frequency response: 20Hz~20kHz System Requirements 9. Windows 98/ SE/ME/2000/XP or later 10. PC with USB port