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Computer
an electronic device for storing and processing data, typically in binary form, according to instructions given to it in a variable program. -
Cellphone
a phone with access to a cellular radio system so it can be used over a wide area, without a physical connection to a network. -
Radio
Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz and 300 gigahertz. -
Television
: an electronic system of transmitting transient images of fixed or moving objects together with sound over a wire or through space by apparatus that converts light and sound into electrical waves and reconverts them into visible light rays and audible sound.