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Infrared technology uses a transmission technique based on the light waves that move within the infrared spectrum.

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Bluetooth relies on short-range radio frequency, and any device that incorporates the technology can communicate as long as it is within the required distance.

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They act as remote transmitters, for reaching locations that the router's Wi-Fi signal cannot.

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They receive the signal from the line provided by the telephone cornpany

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Wi-Fi is a system for sending data over computer networks that uses radio waves.

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It is the range of all frequencies of electromagnetic radiation.