The Tacx Real Life Videos DVDs feature video footage matched with exact course resistance profile for a realistic riding experience.Shot in HD format and are compatabile with widescreen capable Tacx TTS softwareWorks only in conjunction with Tacx i-Magic (WT2020) and Tacx i-Magic Fortius (WT2021) virtual reality trainers (does not play on stand alone DVD playersUses slope and distance following famous roads throughout the world