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Telegraph
Device for transmitting and receiving messages over long distances -
Telephone
System for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals. -
Radio
The transmission and reception of electromagnetic waves of radio frequency, especially those carrying sound messages. -
Television
System for the transmission of images and sounds at a distance by means of Hertzian waves. -
Computer
Electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program. -
Tablet
Portable electronic device larger than a smartphone or PDA -
Mobile phone
Telephone with access to a cellular radio system so it can be used over a wide area, without a physical connection to a network.
