The work, walk or jog with your favorite music without interruption with the Rio Cali 128 MB Sport MP3 player that offers more than two hours of MP3 (about 30 songs) or 4 hours of WMA (about 60 songs) of music with 128 MB of memory. Features: FM tuner, carrying case with armband, expandable memory up to 512MB using SD or MMC card (sold separately); sport clip headphones, USB cable, installation disk, quick start guide, connects to almost any computer, allowing the transfer of content between multiple PCs, 18-hour continuous playback and 5-band adjustable equalizer with presets. Songs purchased from Napster 2.0 are compatible with Portable River. Please use the Rio Music Manager or Windows Media Player 9 to transfer songs purchased from Napster 2.0 to your Rio. Napster 2.0 client users can also use Napster’s free software plug-in for Windows Media Player 9 for an integrated experience. Available storage capacity may vary.