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Point-to-point text messaging system, used from the 1840s until better systems became widespread.
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Telecommunication device designed to transmit acoustic signals at a distance by means of electrical signals
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Telecommunication medium used for transmitting moving images in monochrome or in color, and in two or three dimensions and sound.
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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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Machine that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming.
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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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Portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area.
