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telegraph
a system for transmitting messages from a distance along a wire, especially one creating signals by making and breaking an electrical connection -
telephone
a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals. -
television
a system for converting visual images (with sound) into electrical signals, transmitting them by radio or other means, and displaying them electronically on a screen. -
radio
the transmission and reception of electromagnetic waves of radio frequency, especially those carrying sound messages. -
computer
an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program. -
tablet
a small disc or cylinder of a compressed solid substance, typically a measured amount of a medicine or drug. -
mobile phone
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
