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A telegraph is a communications system in which information is transmitted over a wire through a series of electrical current pulses, usually in the form of Morse code.
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An electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program.
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It's a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals.
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A piece of electronic equipment used for listening to radio broadcasts.
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A device shaped like a box with a screen that receives electrical signals and changes them into moving images and sound, or the method or business of sending images and sound by electrical signals
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A portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
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a mobile computing device that has a flat, rectangular form like that of a magazine or pad of paper, that is usually controlled by means of a touch screen, and that is typically used for accessing the Internet, watching videos, playing games, reading electronic books, etc.
