Avertv MTVHDDUWB HD Duet (White Box) Watch Live TV, Record, Pause, Rewind, Playback HDTV on your PC with Windows XP, XP Media Center Edition 2005 or Windows Vista Watch one HD program and record another, or record two different HD programs simulteneuosly Uses Windows XP Media Center 2005, Vista Home Premium / Vista Ultimate, or AVer MediaCenter ATSC or Unencrypted ClearQAM Support (Digital Cable) / High Definition quality support up to 1080i/720p PCI Express x1, Low profile Form Factor