Elite Realaxiom CT Ritmo with DVDs Block Infinitely variable electro-magnetic resistance controlled by training program or wired remote Multirax computer software includes video and non-video ride simulations and allows up to 8 trainers to be plugged into a single computer for "friendly" competition - includes 2 video races Ritmo dancing feet allow user to ride with a natural, rhythmic rocking motion and Elastogel roller reduces noise by 50% and tire wear by 20%. Windows 2000, XP or Vista An audio card is also recommended. Quick thread hub clamp and spring-loaded resistance mechanism ensure quick, proper setup. ADSL connection (min. 512 Kbps) for the Internet version. Recommended PC characteristics, Processor: Pentium IV @ 2.4 GHz Memory: 512 MB Hard disc: 7200rpm Graphic card: 32MB of memory Miscellaneous: 1 USB port, DVD player (for use of Video-Races) Operating system: