The super-smart Rio Karma 20GB MP3 Player is packed with memory and includes the intelligent Auto DJ to find, mix and create playlists from tracks on command. The versatile docking station supports dual RCA line-outs, Ethernet networking and auto-synchronization with a host PC. Features: plays more than 330 hours of MP3 (about 5,000 songs) or 660 hours of WMA (about 10,000 songs) music with 20GB of memory; USB 2.0 for fast transfers; transfers content between multiple PCs; 15-hour continuous playback; 5-band parametric equalizer with pre-sets; dynamic playlist generation; plays Ogg Vorbis; Sennheiser MX300 earbuds; docking station; USB 2.0 cable; stereo RCA cable; ethernet cable; A/C power supply; installation disk; and quick start guide. Songs purchased from Napster 2.0 are compatible with Rio portables. Please use the Rio Music Manager or the Windows Media Player 9 to transfer songs purchased from Napster 2.0 to your Rio. Napster 2.0 Client users can also use the free Napster Plug-In for the Windows Media Player 9 for an integrated experience. Click on Help at the top of the page, then on Product Rebates where you can download the rebate form. Available storage capacity may vary.