DNC HDMI To Fiber Converter have an extra USB port is available. The USB port in the HDMI converter is used to connect the computer that have a USB port, for selecting/pointing the monitoring visuals .This converter is used for extending videos through fiber. It can transmit HDMI signals for miles over low cost fiber optic cables. Extend a video signal up to 20 km at 1080 p via Fiber optic cable. The main advantages of this device is pure digital transmission with zero compression, no software or driver installation needed. Fiber optics ensure that noise immunity and high level of security. This product is most suitable for that required high speed, greatest distance, real time high video resolution, security and immunity.