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The telegraph is an apparatus or device that uses electrical signals to transmit coded text messages, such as Morse code, over wire lines or radio communications.
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The telephone is a telecommunication device designed to transmit acoustic signals at a distance by means of electrical signals.
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Radio is a means of communication that is based on sending audio signals through radio waves.
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Television is a system for the transmission and reception of images and sounds at a distance that simulate movements, which uses a diffusion mechanism.
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A computer is a programmable digital machine that executes a series of commands to process the input data, obtaining convenient information that is subsequently sent to the output units.
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Mobile phone is a portable phone that can make or receive calls through a radio frequency carrier, while the user is moving within a telephone service area.
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It is a portable electronic device larger than a telephone, smart it is a single piece that integrates a touch screen that emits light and with which it interacts primarily with the fingers or a stylus, without the need for a physical keyboard or mouse.
