The Game Adapter can be used in two different ways. If you have an existing home wireless network and a cable or DSL Internet connection, the Game Adapter lets your PlayStation®2, Xbox™ or GameCube™ attach to the network so you can get into online games without running wires to the game room. Or, use a pair of Game Adapters to form a "cable-less cable" between two game consoles for head-to-head gaming.
More Linksys WGA54G Wireless-G Info & Specification