The SpeedTouch 121g is a wireless 802.11g USB 2.0 Adapter, which enables wireless networking systems to attain data transmission speeds up to 54Mb/s, while remaining backward compatible to the existing installed base of over 15 million Wi-Fi systems worldwide. It supports operation with both the IEEE 802.11b and IEEE 802.11g standards, and features support for WiFi Protected Access (WPA).