WLAN 802.11g USB2.0 Adapter: ZD1211 is a compact, low power, high security and high performance solution for versatile WLAN applications. ZD1211 integrates WLAN MAC controller, base-band processor and USB 2.0 interface in single chip. The integrated USB 2.0 controller reduces the cost and design complexity. No extra memory device is needed. It can fit into small PCB form factor.