There are over 3,000 radio stations in China. China National Radio, the nation's official radio station, has eight channels, and broadcasts for a total of over 200 hours per day via satellite. Every province, autonomous region and municipality has local broadcasting stations. China Radio International (CRI), the only national overseas broadcasting station, is beamed to all parts of the world in multiple languages.
Radio manufacturing expanded significantly during China's Third Front campaign to develop basic industry and national defense industry in China's rugged interior in case of invasion by the Soviet Union or the United States.[1]: 4, 219 In the Third Front regions, radio manufacturing increased by 11,668% percent as a result of the campaign.[1]: 219