*MP3/WMA player support up to 320 kbps bit rate. *LCD(Optional) *Memory internal flash up to 2GB. *Built-in USB connector: USB2.0 *LED indicator with low battery warning function. *Battery:240 mAh rechargeable *Continuous play: 6-8 hours *Operating Systems:windows 2000/XP/Me/NT/and Mac OS 8.6 or higher *Size:57 X 60 X 13 (mm) *SD/MMC card reader