Change one RJ45 plug to two RJ45 female end cables. It can be used to manually switch networks between two devices, but only one of the two ports of the product is always connected to the network. (Please make sure that the unconnected device turns off the automatic network function when connecting) When connected to two devices, you can flexibly switch the network connections by clicking on the programs Disconnect network and Connect to network in both devices. Note: You need to turn off the device's automatic network function in settings or pull out the device that is not connected. Otherwise, no device can connect to the network, as the two devices pre-program the network. Use this adapter to easily convert network signals between two devices to avoid the hassle of frequently plugging and unplugging the network cable. Note: This Ethernet splitter allows two computers to share one Ethernet line one by one, but it does not support both computers to the internet simultaneously.