The WinTV-HVR-2255 has two tuners for watching one TV program while recording another: with the built-in dual tuners, you can either watch one channel while recording another or you can record two channels at once. Create your own personal Digital Video Recorder! Record analog cable TV shows to your PC's hard disk with our built-in high quality MPEG-2 hardware encoder. You can also record high definition digital ATSC and clear QAM digital cable TV to disk in the original digital quality. Use the WinTV-Scheduler to schedule the recordings of your favorite analog or digital TV programs. Play the recordings back to your PC screen at any time. Windows Media Center compatible: Windows Media Center supports two TV tuners. Use the Media Center scheduler to schedule your TV recordings. And WinTV-HVR-2255 has Windows Vista Premium certification. New! Now supports clear QAM with Media Center TV Pack 2008, Windows 7 and Windows 8 ( with Media Center Add on) Clear QAM TV channels are unencrypted digital TV channels broadcast by your local cable operator. Many cable operators in North America are transmitting the high definition ATSC channels on their cable networks. They also broadcast the basic cable channels in using clear QAM. You can use Windows Media Center from Windows 7 to watch and record these channels. Note: you need to be using Windows Media Center with TV Pack 2008,Windows 7 or Windows 8 for clear QAM TV compatibility. ATSC digital TV is the over-the-air HD digital TV for North America. ATSC digital TV typically requires an antenna for reception, and is currently broadcast in 200 cities, with over 1500 TV stations. ATSC broadcasts range in resolution from standard definition up to the high definition 1080i format. The WinTV-HVR can be used to watch and record all ATSC formats.Note: ATSC digital TV is NOT digital cable TV or digital satellite TV. ATSC is digital over-the-air TV. ATSC digital TV brings you sharper pictures and enriches your PC's multimedia experience with near CD quality sound. WinTV-HVR's ATSC digital TV tuner adds great features to your TV viewing: high definition TV reception, automatic identification of channel names plus records high-definition digital TV programs to your PC's hard disk in an MPEG-2 format without any loss in quality.