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The telegraph is a device or device that uses electrical signals to transmit encrypted text messages.
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The telephone is a telecommunication device designed to transmit acoustic signals remotely by means of electrical signals.
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It is a means of communication that is based on the sending of audio signals through radio waves.
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Is a system for transmitting images and sound at a distance through Hertian waves
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A computer, is an electronic machine that receives and processes data with the mission of transforming it into useful information
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It's a type of laptop, larger than a smartphone or a PDA, integrated into a touch screen (single or multi-touch) with which you interact primarily with your fingers, without the need for a physical keyboard or mouse.
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The mobile phone is an electronic wireless device that allows access to the cellular or mobile phone network.
