The Wireless-G WRT54G3G-ST Router for Mobile Broadband is really three devices in one box. First, there's the Wireless Access Point, which lets you connect both screaming fast Wireless-G (802.11g at 54Mbps) and Wireless-B (802.11b at 11Mbps) devices to the network. Second, it's a built-in 4-port full-duplex 10/100 Switch to connect your wired-Ethernet devices together. Connect four PCs directly or attach more hubs and switches to create as big a network as you need. Thirdly, the Router function ties it all together and lets your whole network share a mobile broadband Internet connection (requires a mobile broadband data card). Alternatively, you can also connect a cable or DSL modem to the Ethernet port and access the Internet via your available broadband service.