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A computer is an electronic device that manipulates information, or data. -
The telegraph is for transmitting text messages. -
The telephone they work by sending signals to cell tower, using RF waves. -
Radio is sound communication by radio waves, usually through the transmission of music, news, and other types of programs from single broadcast stations to multitudes of individual listeners equipped with radio receivers. -
It is a system for sending moving pictures and sound from one place to another. -
Is a wireless, portable personal computer with a touchscreen interface. -
Is a wireless handheld device that allows users to make and receive calls.