TiVo TCD648250B Series3 HD Digital Media Recorder (2008 Model) The world's first THX-certified DVR, delivers the highest-quality home theater AV experience 300 hour recording capacity, twice as much as most cable alternatives; 25-35 hours of HD Easily connect to your home network with built-in Ethernet and USB ports Record 2 live digital cable channels at once, while watching a pre-recorded show TiVo service subscription required