Product Description Light-Link Fiber 8K Hdmi 2.1 Cable, 30Ft By Sewell, Black The converters inside the cable heads convert incoming electrical signal into optical on one end, and back into electrical on the other end. The Light-Link is composed of fiber cables and copper cables. The copper cables are used for non-video information such as hot plug detection, grounding, and +5v power. The fiber strands carry all the video information. The light travels down the fibers using internal reflection, which allows the light to bounce off the cable walls similar to a bobsled. Light travels extremely fast (186,000 miles a second) so the signal arrives almost instantly without losing any quality. Since the optical converters are housed inside the heads of the cable, there is no need for any external repeaters. This also means that there is no need for extra power adapters or patch cables. The Light-Link eliminates possible points of failure. In a typical HDMI extender setup you have four HDMI connections (source to sender and receiver to display) plus two RJ45 connections and two power connections from the baluns to the wall. Thats eight possible things that can come unplugged, plugged in the wrong way, worn out over time or just need to be stuffed somewhere out of sight. With the Light-Link you only have one cable connected directly and can be easily verified end to end. Troubleshooting is incredibly easy compared to any other setup. California Prop 65 Warning : This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information visit to the website.