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The telegraph is an apparatus or device that uses electrical signals to transmit coded text messages, as with Morse code.
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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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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 radio is an electronic device that allows the recovery of voice signals or of any other type, transmitted by a radio transmitter using electromagnetic waves.
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It 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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It 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.
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es un dispositivo electrónico portátil de mayor tamaño que un teléfono inteligente o un PDA, se trata de una sola pieza que integra3 una pantalla táctil que emite luz4 y con la que se interactúa primariamente con los dedos
