The KanexPro High Speed HDMI/DVI cables with Ethernet are for applications that require high-performance transmission of HDMI digital video and multi-channel audio signals, active amplification built-in to the cable prevent impedance mismatch, caused by the cable attenuation, dielectric losses and compensation for skin effect over long distances. For flawless transmission, the output of the cable is placed at the end of the display to amplify full signal transmission with zero signal loss. The built-in booster does not require an external power, since it is using the 5-volt from pin 18 on the HDMI cable extracting the power from the display. These cables are fully CL3 certified which surpasses any in-wall code requirement for residential or commercial installations.