Rio Nitrus 1.5 GB MP3 Jukebox 1.5 GB HDD plays over 25 hours of MP3 of 50 hours of WMA music Includes Sennheiser earbuds 5-band adjustable equalizer with pre-sets 16-hours continuous playback with rechargeable LiIon battery Compatible with computers with USB 2.0 (1.1 compatible) ports running Windows 98 SE, 2000, ME, or XP