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Is the long-distance transmission of textual messages where the sender uses symbolic codes.
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A system for transmiting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals.
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An electrical device that recives radiotelegraphy or radiotelephony waves and transforms them into signals or sounds
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Is a telecommunication medium used for transmitting moving images in monochrome or in color and in two or three dimensions and sound.
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Electronic machine able to store information and processing it automatically through mathematical and logical operations controlled by computer programs.
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Portable electronic device with touch screen and multiple features.
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Is a portable telephone that can make or receive calls through a radio frequency carrier, while the user is moving within a telephone service area
