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I couldn't get a straight answer from anyone about what this device could actually do. I had to buy it to find out. Not sure why it seems as though nobody has ever used a TV tuner before (including the cable guy installing the box who said "man, you can do that?"), but I purchased anyway. It works well. I plugged it directly into the output feed coming from my digital cable box, then into my PC via the provided USB cable. I imagine the faster your processor the better the output on the screen, but my picture is great and smooth. I had to install it via the component cables instead of the coax (not included) and change the channel with the supplied remote, but works 100%. Also, it's good to know that I can hook up any external device that has component cable ports - PS3, XBox, Video Camera, Etc. I can even record or take pics of the feed from the software provided. I totally recommend!