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The telegraph is a device used to communicate at a distance. It uses electricity to send coded messages through the wires. -
It is a machine that stores and automates information through computer programs specifically designed for this task. -
is an device that trasmit sound by a cable electical signs. -
It is a means of communication that is based on the sending of audio signals through radio waves. -
It is a system for transmitting images and sound at a distance through Hertian waves. -
is a mobile computing device in which the touch screen occupies almost its entire size and in which there is no physical keyboard. -
It is an electronic wireless device that allows access to the cellular or mobile telephone network. It is called cellular due to the repeater antennas that make up the network, each of which is a cell, although there are satellite mobile telephone networks.