support Music Format MP3 or WMA Playing Modes: Cycle one/ Cycle all/ Play random/ Play normal/ Special preview mode capacity memory: 512M-2GB Voice recording: 540mins/128M Outputs Power: 5mW Frequency Response: 20Hz-20KHz Support OS:Windows 98/Me/2000/XP/Mac OS 9.X/Linux 2.4.X. The OS above win 98 without driver USB2.0 portable disk function