If you want to protect your expensive home theater from lightning and other outside surges that come over the cable TV line, then this is what you need. TIIs cutting edge In-Line Coaxial Lightning Surge Protectors protect personnel and customer equipment, e.g. Televisions, Cable Set Top Boxes and Cable Modems from lightning and power induced surges on coaxial cables. It is specifically designed for todays Broadband signals carried over the coax cables.