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Since Bell invented the telephone, so that everyone holding a 'drifted', and distant relatives and friends chatted up. Telegraph and telephone have been invented to make human access to important means of long-distance transmission of information. However, the electrical signal is transmitted through the wire, the line set up to the place, in order to spread information, which greatly limits the circulation of information, especially in the sea, Gao Shan cell phone camera recovery, there is no cause information to wireless dissemination of solutions? In 1820, Danish physicist Oersted found that when there is a current through metal wires when placed near the needle deflected it will happen. Then, apprenticeship British physicist Faraday made clear that where there is cell phone camera recovery, Auster proved the 'energy magnetism'. He also through hard experiments and found that the phenomenon will lead the movement in the magnetic field generated by the current, namely the so-called 'induction' phenomenon. Discovery of electromagnetic waves had a tremendous impact. Less than six years, the Russian Popov, Italy's Marconi invented wireless telegraphy were camera phones recycling companies to achieve a radio dissemination of information, other radio technologies also sprung up. 1904 British electrical engineer Fleming invented the diode. 1906 American physicist Fessenden successfully developed radio. 1907 American physicist invented the vacuum triode Telford Leicester, Institute of Electrical Engineers Armstrong use of electronic devices invented superheterodyne receiver. 1920 American radio expert Conrad in Pittsburgh established the world's first commercial radio station, from broadcasting to flourish around the world, radio become a convenient way to keep up with news. 1933 French Claver between Britain and France established the first commercial microwave radio link, and promote the further development of radio technology. Also contributed to the discovery of electromagnetic wave propagation technique developed rapidly image. 1922, 16-year-old American high school students Philo Farnsworth 丨 design schematics first web TV Fax, applied for a patent in 1929, was held to be the first who invented the television. 1928 Westinghouse Electric Company Ziwo Er Jinfa Ming photoelectric CRT Sony camera phone recycling, and cooperate with engineers Fan Wasi, to achieve the electronic scanning of a television transmission and transmission. Empire State Building in New York in 1935 the United States set up a television station, the following year on the success of the TV program transmission to place 70 km away. 1938 兹沃尔 gold and created the first practical television cameras comply with the requirements. After continuous exploration and improvement of people, in 1945 on the basis of the principle of trichromatic Radio Corporation of America made the world's first all-tube color television. Until 1946, the Americans Ross' Weimar invented the high-sensitivity camera tube, the same year the Japanese professor solves eight home TV reception antenna problems, since some countries have established a ultrashort wave relay station, TV quickly gaining in popularity.