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Una computadora es una máquina electrónica digital que se puede programar para realizar secuencias de operaciones aritméticas o lógicas automáticamente. -
An electric telegraph was a point-to-point text messaging system, used primarily from the 1840s to the late 20th century. -
The telephone is a telecommunication device created to transmit acoustic signals at a distance by means of electrical signals. -
Electronic television was first successfully demonstrated in San Francisco on Sept. 7, 1927. The system was designed by Philo Taylor Farnsworth, a 21-year-old inventor who had lived in a house without electricity until he was 14. -
Is a portable electronic device larger than a smartphone, it is a single piece that integrates a touch screen. -
Is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area. -
Radio is the signaling and communication technology using radio waves. Radio waves are electromagnetic waves with a frequency between 30 hertz and 300 gigahertz.