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telephone
a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals.
"a telephone call" -
televison
a system for transmitting visual images and sound that are reproduced on screens, chiefly used to broadcast programs for entertainment, information, and education.
"the days before television" -
radio
the transmission and reception of electromagnetic waves of radio frequency, especially those carrying sound messages.
"cellular phones are linked by radio rather than wires" -
smartphone
a mobile phone that performs many of the functions of a computer, typically having a touchscreen interface, internet access, and an operating system capable of running downloaded applications. -
twitter
(of a bird) give a call consisting of repeated light tremulous sounds.
"sparrows twittered under the eaves"