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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. ... The telegraph has been in use for more than 150 years.
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The telephone is the electrical system of communication that you use to talk directly to someone else in a different place.
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television is an electronic device used to receive sound and images which create television programs that people watch
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the transmission and reception of electromagnetic waves of radio frequency, especially those carrying sound messages.
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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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A tablet computer, commonly shortened to tablet, is a mobile device, typically with a mobile operating system and touchscreen display processing circuitry, and a rechargeable battery in a single, thin and flat package.
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a telephone with access to a cellular radio system so it can be used over a wide area, without a physical connection to a network.
