A computer, two network switching, easy to use, no power drive needed. ? Real physical isolation, there is no electrical wiring connection between the internal and external networks. When the network load and the amount of data communication is high, does not have the network congestion and data substitution problem. Long service life, repeated switching times up to more than 100 thousand times. No power supply, no electronic switch, no electrical interference to network signals. UTP STP 2 in 1 out 2 Ports RJ45 LAN CAT Network Switch Selector Internal External Networking Switcher Splitter Box.