Qihoo 360 Technology Co Ltd (Qihoo 360), formerly Qihoo Technology Company Limited, is engaged in the operations of Internet services and sales of third party anti-virus software in the People's Republic of China. It provides Internet and mobile security products in China. In January 2011, the Company had 328 million monthly active Internet security product users, representing a user penetration rate of 83.9% in China. Its Internet and mobile security products include 360 Safe Guard and 360 Anti-virus, the Internet security products in China, with 301 million and 248 million monthly active users in January 2011, and 360 Mobile Safe, the mobile security product in China. The Company generates revenues primarily through offering the services, such as online advertising and Internet value-added services. Online advertising offers advertising services by providing marketing opportunities on its Websites and secure platform products to its advertising customers.