This device works great if you are going from RCA jacks to Coax and I'm sure with most S-Video devices. There are two problems I had with it that forced me to return this product and get a different brand. The componant video in will not work if an S-video cable is plugged in, even if it isn't hooked to anything. This is only a problem if you are using multiple video sources.Second, Most laptop computers (I tried a compaq with high end ATI, a dell with intel graphics chip and an HP with Nvidia) simply will not detect the TV through this box. I returned it and got another and they still did not work. All three of these laptops worked instantly with the same setup and a different brand box.