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Computer
Is a machine that we use to play games, watch movies, write texts, surf the Internet or draw. -
Telegraph
Is a device that uses electrical signals to transmit messages, such as Morse code -
Telephone
is a device that transmit sounds at a distance by means of electrical signals. -
Radio
Is based on sending audio signals over radio waves -
Television
Remote image and sound transmission system -
Tablet
It's a portable, larger than a smartphone or PDA, integrated into a touchscreen -
Mobile phone
Is a portable device that can make or receive calls