The Networx Gigabit Ethernet Fiber Media Converter is a black device that converts UTP Ethernet signals to 1000Base-SX-ST multimode fiber optic signals. It features an Ethernet connector (RJ-45 female) on one side and an ST connector on the other. This converter is designed for use in networking applications where high-speed, reliable connections are needed. With its fiber optic capabilities and Gigabit Ethernet support, this product provides a secure and efficient way to transmit data over long distances.