ALife RJ45 Ethernet Splitter allow 2 computers to share high speed DSL, cable modem or other Ethernet ports.NOTE: Don't support 2 computers that connect to the internet simultaneously, ONLY 1 output port is working. ALife RJ45 Ethernet Splitter is not a switch so that it can not implement 2 computers sharing the internet at the same time. Transmission is more stable, it has a superior connection and transmission.