The Ceton InfiniTV 4 USB is an external 4-tuner digital cable TV device that turns your PC into the ultimate set-top box and DVR. With InfiniTV on your PC, you can replace your cable set-top box and associated monthly lease and DVR fees and use Windows 7"s built-in Media Center functionality to watch and record 4 live cable TV channels at once, including HD and premium channels like HBO, Showtime and Starz! InfiniTV 4 USB uses the same award-winning technology as Ceton"s InfiniTV 4 PCIe, the world"s best-selling digital cable tuner for the PC. If you"re looking for an internal device with the same capabilities, check out the Ceton InfiniTV 4 PCIe model.When used with Media Center Extenders like the Xbox 360, you can also stream live or recorded cable channels to other TVs in your home over your home network. Using only a single cable connection and single CableCARD from your cable operator, InfiniTV can deliver all your cable channels and full DVR capability on any TV set. Requires a compatible PC with Windows 7 Home Premium, Windows 7 Professional, or Windows 7 Ultimate and an available USB port. Requires a cable TV subscription and CableCARD from your cable operator. Media Center Extender(s) required to access cable channels and recordings on secondary TV sets.