From Linksys, A Division of Cisco Systems:
Linksys Wireless-G USB Network Adapter with SpeedBooster Connect your USB-equipped desktop or notebook computer to a wireless network at incredible speeds with the Linksys Wireless-G USB Network Adapter with SpeedBooster. Using your high-speed USB 2.0 port, the Adapter delivers incredible data rates without the trouble of opening up the case of your computer.
High-speed wireless networking for your desktop or notebook via USB 2.0.
New SpeedBooster technology increases Wireless-G performance by up to 35%.
Easy, no-tools setup on any desktop or notebook computer with USB support.
Wireless communications are protected by up to 128-bit data encryption.