The Aver Media ATSC TV Tuner Card PCI-Express 0405ACVA M791-A M791AB is a TV tuner card designed for computers with a PCI Express port. It features composite RCA input and CATV/RF coaxial output, supporting ATSC broadcast formats. The card functions as a TV tuner, converting analog to digital video for capture and playback on the computer. With its compatibility with PCI Express ports and support for various external interfaces, this Aver Media card offers a convenient solution for accessing and recording digital TV signals on a computer.