Wireless is an expression in the field of telecommunications.

It describes that electromagnetic waves and no cable transmit a signal over a communication path.
Some surveillance devices, such as a burglar alarm, rely on acoustic waves that are at frequencies outside the human hearing range.
The first transmitters used in radiotelegraphy (Morse code) in the early 20th century.
Later, thanks to modulation, speech and music could also be transmitted wirelessly. The medium is well known and is called radio.
The term wireless has revived through television, fax, data communications, and the effective use of a broader range of the spectrum.

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