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A telegraph is a communication system in which information is transmitted over a wire through a series of pulses of electrical current, usually in the form of Morse code.
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Is a system used to send speech or data over distances that functions as the transmitter and receiver.
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Radio is a means of communication that is based on sending audio signals through radio waves,
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It is an electronic device for the reception and reproduction of television signals. Usually it has a screen and commands or controls
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is a programmable digital machine that executes a series of commands to process the input data
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It is a 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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Is a portable electronic device larger than a smartphone or PDA
