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DT
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'Wireless' means without wires...

Infrared is on the electromagnetic spectrum and has a wavelength longer than that of visible light, but shorter than that of microwaves which are also part of the same spectrum that WiFi and other 'radio' transmitters use.

Infrared may require line of sight to work properly, but there are some radio systems that are virtually the same. Some cheap Bluetooth-type solutions - used with model rail controllers - can't be used more than a few meters from the base station.
 
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