*MP3/WMA player support up to 320 kbps bit rate. *LCD(Optional) *Memory internal flash up to 2GB. *Built-in USB connector: USB2.0 *Auto power off *FM(optional) *Recording(optional) *Hold switch:Five-key button *Output power:5m W. *Battery:1XAAA *Operating Systems:windows 2000/XP/Me/NT/and Mac OS 8.6 or higher *Size:83 X 24 X 8 (mm) *Net weight(without battery):18g