These PCI boards connect to your cable TV or to a TV antenna, and display live TV in a resizable window. They do this by digitizing the live video (from either the built-in 125-channel cable TV tuner with DBX-TV stereo and FM radio or the external video-input source) using high quality 4:2:2 video sampling. The digitized video is sent over the PCI bus into the memory of a VGA display adapter, a technique which makes the WinTV PCI boards easy to install and gives a great looking TV picture!