Cisco-Linksys PLS300 PowerLine AV 4-Port Network Adapter Use your existing powerlines to network your computers and other devices Share files, printers, storage, and networked games throughout your home  connect it to a router to share your Cable or DSL Internet connection Built-in 4-port Ethernet switch HomePlug AV technology for data rates up to 200Mbps 128-bit encryption helps keep your data secure