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The Linksys(r) WRT-54GR Cable/DSL Router acts as 3 devices in one box: a Wireless Access Point, which lets you connect a multitude of devices to the network, a built-in 4-port full-duplex 10/100 Switch to connect your wired-Ethernet devices together, and a router that lets your whole network share resources! The RangeBooster uses smart receivers at each end to detect and decode reflected signals at far distances.