The AVerTVHD Duet will give your existing HTPC a “Power Boost” to higher levels of HD digital entertainment. It’s designed to receive High Definition Digital TV Over-the-Air (ATSC) or Unencrypted Digital Cable (ClearQAM*) signals directly to your PC! The AVerTVHD Duet is a dual digital tuner, with a single input, that adopt the brand-new PCI Express interface, which offers a stable and higher bandwidth tranmission environment than the traditional PCI bus. One of the great features about a dual tuner is that the user can watch one program, while recording another, or record two programs simultaneously! AVerTVHD Duet is certified with Windows Vista and XP Media Center, and is the solid choice to enable users to watch HDTV in the home or office right on their PC. This product supports High Definition TV viewing up to 1080i resolution with aspect ratios of 4:3 and 16:9. The AVerTVHD Duet will enhance your existing home entertainment center capabilities with High Definition TV viewing. ClearQAM is only for AVer MediaCenter and Windows Media Center TV Pack 2008; Specification:Input Signal; 75 Ohms TV Antenna Input; System Requirement:; For TimeShift and Record in MPEG-2; Intel Pentium 4 3.0Ghz with HT (Hyper-Threading) or Equivalent AMD processor ; 128M VGA card with Direct 9.0c or above; 512 MB RAM or above ; PCI-Express x 1 slot ; Sound card ; Uses Windows XP Media Center 2005*, Vista Home Premium / Vista Ultimate, or AVer MediaCenter ; 200 MB hard disk free space;Analog TV Tuner & Certified MPEG-2 Decorder Required; Package includes: AVerTVHD Duet; Low Profile Bracket; CD (Includes: Drivers, Quick Guide and User Manual); Warranty Card